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Going larger than what you had is ok, going smaller than what you had, may not be a good idea..... May not have enough output to keep the battery charged.
Does it matter much if I have a 117amp or 136amp alternator in my 2002 ram van?
I remember when alternators were 40, 50 or maybe 90 amps. I always go a little bigger. Back in the 1960's and 70's, we didn't have all the electronics and a/c on stuff like we do now. The lower output will need to be driven a lot more to charge your battery. Personally, when replacing an alternator, I will put the highest out put unit that will fit.
