As Isobarik said, Car1 is a ZX-R Mk2 and car2 is a ZX-R Mk1.
Car1 is identified as a Mk2 by the kingpin mounted front upper links, extensions on the rear uprights, longer top deck, shorter one piece motor mount and wraparound gearbox brace. The Mk2 moved the rear top deck support backwards to enable the batteries to move backwards 5mm to improve the balance when jumping. The shock mounts, shocks, chassis, top deck and suspension arm mounts are all upgrade parts.
Car2 is identified as a ZX-R mk1 by the outboard mounted front upper links with the long bent ball joints to clear the uprights and the rear upper links mounted directly on the uprights, shorter top deck, longer two piece motor mount and thinner gearbox brace above motor. The front shock mount, chassis, top deck and suspension arm mounts are all upgrade parts. The rear shock mount is from the ZX-R Mk2. The machined alloy knuckles are another third party upgrade, it should have plastic ones like the other car.
The slipper clutch only identifies them as a ZX-R, both Mk1 and Mk2 use the same slipper. The ZX-RR uses a different slipper clutch, but it also uses different shocks as well so they are obviously both ZX-R.
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