Kyosho ZX- ...?? Which version?

[Durango]

Hi guys,

Got 2 Kyosho Lazer saturday. I get the 2 cars from the same guy for a good price, but he gave up that hobby since years and don't know any more which versions they are. I'm not such a Kyosho specialist... so I need your help now

Both cars are almost complete and basically in good shape... Either one should be a ZX-RR, there is in effect no doubt

But the other one...no idea! I think it should be a ZX-R or ZX-R Mk2. But what's the difference between both version?

Here's the car:







Regards,
Daniel