The difference is in the front wheels (flater faced wheel is the later one), I've measured and there is no difference at all with the rears.
They are slightly different stiffnesses so I'd not mix them across an axle but otherwise all is good with the rears.
If you want to get the best out of them use the older lipped wheel when you want more wheel flex, the newer flat faced rear wheel when you need them really stiff.
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