s1155 is almost identical to s1156, and shouldn't have any trouble with it. AFAIK s2011 is backwards compatible with s1366 for cooling. So your H50 shouldn't have any issues. As he said, its a pretty simple bracket change even if they're not actually backwards compatible for cooling.
1155 would probably be the same size as 1156 just like AM2 is identical to AM3 so no big difference there, unless if Intel pulled something off to make it incompatible but who knows.