89 rt trans

Ok I've read a few posts and seen two different things. One being the 88 and 89 are different from the 90 -91, but also read that just the 88 is different. I have a 90 and the reverse is going out and I found a trans a guy says is a 89 and im just wondering if it will work. And is the spline count the only difference? And what should the count be for 89 and also for the 90

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