Some people think the H072 has the load bolt that keeps the ring gear from deflecting and the H052 doesn't, but I've seen them both ways. If you have some time and want to learn about these axles, read this thread
https://www.pirate4x4.com/threads/eaton-h072.771317/
Lots of good info in there


Liquidated my projects
Now looking for a decent '47-'55.1 3100, 3600, or 3800