B3, B4 wheels

[J.Kirkman]

Hi guys, is there any difference between the wheels used on the old B3 and the B4? offset, size, fitment ect.

I've just started racing again after many years out of the loop and dusted off my old B3.
Now I'm looking at getting an X6 squared and need to know if the vast amount of wheels and tyres I have will fit it.

Thanks.