Differences B/W 72 and 73 bucket seats

[jmking9]

I've done some searching/reading on here, and other forums trying to get a definitive answer on the differences between 72 and 73 bucket seats.
I came across a really nice set of front buckets and console out of a 73 Blazer. The price was too good to pass up, so I grabbed them up. I can tell by looking at them the mounting brackets are completely different. But the seats themselves look exactly like a 72 bucket?
So here are my questions:
1. Are the foams different from 72 to 73?
2. Will 69-72 mounting brackets bolt to the 73 seats?

If there are too many differences to make them work, I'll probably just pass them along to someone with a 73-up. Thank you!