I think the 944 was quite a bit different from the 924. Maybe it was the same platform, but if you check out the interior, dash, engine specs and so on, the 944 was basically it's own model.
I seem to remember the early 944s had motor mount problems and something to do with the dashboard.... I can't remember if it was a heater core problem or what..... but when I was looking, I was advised to get a newer model rather than older. I ended up ditching the idea and buying a second generation Toyota MR2.