IF they were the same width, I believe so, but they're probably not.
8.8's from (IIRC) 93+ are wider by 1.5" or something like that.
But if you upgrade to an 8.8 with the small shafts, it's almost a downgrade. there only an increase in strength in the R&P, so unless yo're going through pinions and ring gears, thats pretty pointless. And it will greatly reduce the ground clearance, the 8.8 is surprisingly larger than the 7.5"
Though 8.8" from a GenI or GenII I think are the same size.
That is a very good page on the differences.
Go, Read you must.