I have not been able to find that option. Here is a decoder that is very helpfull.
http://www.kindel.com/Porsche/options.asp
C02 Catalytic Converter
C03
C77
R01 Touring Package (Not Available w/ Airbags)
R74 Touring Package
009 Sporto-matic transmission
018 Leather STR Wheel/Raised Hub 380MM(Not Available w/ Airbags)
020 Speedometer with 2 scales KPH/MPH
024 Version for Greece
026 Activated charcoal canister
027 Version for California
030 Club Sport Package
031 Sport shock absorbers
034 Version for Italy
036 Bumpers with impact absorbers
058 Bumpers with impact absorbers
061 Version for Great Britain
062 Mud flap (version for Sweden)
070 Tonneau cover - Cabriolet
103 Adjustment of shock absorber strut
113 Version for Canada
119 Version for Spain
124 Yellow light (version for France)
126 Stickers in French
130 Labeling in English
139 Heated Seat Left
152 Engine noise reduction
153 Engine parts belonging to a stipulated assembly for type 951
154 Control unit for improved emissions
157 Oxygen sensor and catalyst
158 Radio "Reno"
160 Radio "Charleston"
164 Tires 215/60 VR15
176 Oil cooler with fan
185 Automatic 2 point rear seat belts
186 Manual 2 point rear seat belts
187 Asymmetric head lights
190 Increased side door strength
193 Version for Japan
195 Prepared for cellular telephone
197 Higher amperage battery
215 Version for Saudi Arabia
218 License brackets front and rear
219 Differential
220 Limited Slip Differential
221 Porsche-locking differential
225 Version for Belgium
240 Version for countries with inferior fuel
241 Shorter shifting travel
243 Shorter gear shift lever
249 Automatic transmission
255 Fuel consumption indicator
258 Heating for outside mirror
261 Passenger side mirror - electric - plain
262 Outside mirror for passenger side, plain, manual
277 Version for Switzerland
286 High intensity windscreen washer
288 Headlight Washers
298 Prepared for unleaded fuel, manual transmission
302 Type designated on rear end
308 Pneumatic spring for engine hood
323 Sticker, without ESE-Regulations
325 Version for South Africa
330
331 AM/FM Cassette w/2 door speakers
335 Automatic 3 point rear seat belts
340 Heated Seat Right
341 Central Locking System
346 Standard color rims (silver)
347 Platinum anodized wheels
348 Forged wheels - Grand Prix White
351 Porsche-car radio, CR stereo, type DE
360 Mud Guards
375 Clutch lining without asbestos
377 Combination seat, left, adjustable
378 Combination seat, right, adjustable
379 Series seat, left electrical vertical adjustment
380 Series seat, right electrical vertical adjustment
381 Series seat, left
382 Series seat, right
383 Sport Seat Left w/Elec. Height. Adj.
387 Sport Seat Right w/Elec. Height. Adj.
389 Porsche-car radio, CR stereo, type US
391 Stone guard foil, added separately
393 Forged Alloy Wheels-8/9x16 (944/944S) (944 Turbo)
394 Pressure Cast Magnesium Rims (944/944S) (944 Turbo)
395 16" Forged Alloy Wheels (944/944S) (944 Turbo)
396 Disk wheel, telephone styling 8Jx15 rear
398 Outside Electric Mirror, Left
399 A/C without front condenser
400 Pressure cast wheels
401 Light metal wheels
402 50 year anniversary car 1982
403 Pressure cast 17" wheels
404 Stabilizer Bars Front & Rear
405 Level control system
406 50 year anniversary car 1982
406 Front wheel housing protection 1983-1986
407 18-inch polished wheels
409 Sport seats left and right leather
410 Sport seats left and right leatherette/cloth
411 License bracket, front
412 External oil cooler
414 External Transmission Oil Cooler (Turbo)
415 Wider rear track
418 Body Side Molding
419 Rear luggage compartment instead of rear seats
422 Porsche-car radio, CR stereo, type RW
423 Cassette container and coin box
424 Automatic heating control
425 Rear Window Wiper
426 Special model World Champion 1976 1978
429 Fog headlamp, white
429 Special model "Sebring"
431 Leather Steering Wheel 363MM (Not Available w/Airbags)
432 Sports steering wheel, leather 363mm (4 spokes)
437 Full Power Seat Left
438 Full Power Seat Right
439 Electric Cabriolet top
439 Special model "Weissach" 1980
440 Manual antenna, 4 speakers
441 Fader, antenna booster, 4 speakers
441 Radio speakers and antenna amplifier
442 Prepared for radio without antenna
443 Tinted front and side glass, heated windshield
444 Cabriolet
446 Parts for type "Targa" belonging to stipulated assembly
447 Emergency wheel - with collapsible tire
450 Light metal wheels
451 Prepared for radio for sport group
454 Automatic Speed Control
455 Wheel locks
458 6" Cast Alloy Wheels
461 Electric antenna, 4 speakers
462 Special model "Weissach" 1982
462 Sekuriflex windshield
463 Clear windshield
463 Lateral glasses tinted, (version for Australia)
464 Without compressor and tire pressure gauge
465 Fastening parts for transportation (version for overseas)
467 Drivers side mirror, convex
468 Graduated tint windshield, green side glass
469 Black headliner
470 Without spoilers, in conjunction with turbo look
471 Sport group 1
471 Integrated rear spoiler
472 Rear Apron
473 With spoilers
474 Sport Shock Absorbers
475 Brake pads without asbestos
475 License plate fastening (version for Austria, Finland, Australia)
476 Brake pad with abrasive pad
479 Version for Australia
481 5 speed manual transmission
482 Engine compartment light
483 Right hand drive
484 Symbols for controls
485 Forged wheels - gold metallic
487 Connection for fog headlamp with parking light
488 Stickers in German
489 Symbols and insignia in German
490 Sound Package
491 Turbo look
492 H4 headlights for left hand traffic
494 Amplifier System
494 2 speakers on back shelf
496 Black trim - painted headlight rims
498 Delete Model Designation-Rear
499 Version for West Germany
503 Cabrio variant (Speedster)
505 Slant nose
513 Lumbar Support-Right Seat
525 Alarm with continuous sound
526 Door Panels Covered w/Cloth
528 Passenger side mirror convex
529 Outside mirror - passenger side, convex, manual
533 Alarm System
537 Left seat with positrol and lumbar
538 Right seat with positrol and lumbar
548 Fuel filler neck, unleaded fuel with flap
553 Version for USA
559 Air conditioner
Not sure about the engine differences.
