I don't have your direct answers, but I have years of Mitsu/Hyundai hybrid engines. Simply put, they are the same engine with subtle differences (like bolt holes and patterns). The reason is the same as mentioned earlier - they're basically all Mitsu's.

I'm also an engineer/fabricator/welder/machinist/car builer. That being said, virtually any engine can be stuffed into virtually any chassis. It's not that difficult to do in most cases. You're probably not going to find the exact pattern of that engine. However, if you just "pull the trigger" and buy it, you can pretty much be assured it will go in easily. It might not be budget friendly, but it can be done.