I don't think so, an 89 has a 60amp alt. and a 93 has a 70amp. Not to be nosy but why wouldn't you just have the other one rebuilt its usually the brushes or voltage regulator and a rebuild shop can do it for about 60 bucks(in my area) in about a day. You are right, they are both 1493cc or 1.5l but have different electrical demands.