Yes, most YJ, TJ, and XJ wheels will interchange.
stock specs
15x7 - 5.25" backspace = YJ,TJ,XJ
15x8 - 5.5" backspace = TJ
most aftermarket wheels will fit them all too.
15x7 - 3.75"to4.5" backspace
15x8 - 3.75'to4.75" backspace
If you want to run wide 12.5" tires on an 8" rim, you would want a 4.5"-4.75" backspace if you are running stock fender flairs.
I am running 15x8 - 3.75" backspace with 31x10.5 tires and the front tires stick out a little, rear tires are flush with flairs. I put a set of 33x12.5 tires on the same size wheels from a friends TJ on my XJ and the tires tread stuck out about 1.5" past the flairs.
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LOST in Oregon
'04 KJ sport, Rustys spacers front+ Skyjacker coils rear,16"x8" Rubi's LT245/75R16 BFG A/T, Mopar skids & hooks, Reese Hitch.
'96 XJ sport, Rustys lift NOW 4.25" with arms, NOW 32x11.5R15 muds, Rustys hooks, Valley Hitch.
http://www.cardomain.com/ride/2273596
'78 Z-28 & '96 Metro