I've done a bit of doing that. The base gasket and head gasket both interchange between the two motors. I can't tell if the cylinder is the same basic part because it was painted black in '89 and silver in '92. It seems to be the same cylinder, though.
There seems to have been a change in the cylinder partway through the '88 model year. The head gasket bolt pattern is different. The base gasket is the same, so it looks like you could swap the parts onto a later motor, though you'd have to use the earlier head as well. In my case, I'm thinking that the '89 parts will all swap onto the '92 motor, though I could still be wrong.
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