Are all 273 V8's the same?

It's been a while since I've posted here. I have been dealing with B and C bodies lately while my A-body sits on the back burner for now.

So in a thread on FBBO I talked about finding another 273 at a local junk yard that's going out of business. They said it came out of either a 66 or 67 Barracuda. I want it for a spare for my 65 Belvedere wagon 273. Are there any little differences in the motors that I should know about? Things like motor mount location, oil pan, oil pick up etc. I know my 65 Belvedere has it's little differences with later small blocks. I'm just wondering if there is anything I should be aware of or is it a direct bolt in? If it's a direct bolt in I may freshen it up and then rebuild the original in my B-body. Not looking for performance, just a stock 2 barrel motor.
You're going to get a lot of different answers and some of them won't be correct. Your FBBO thread has the bet answers.