Combination Valve Install question

Took the new valve apart and cleaned it, I also took the old one apart to see if it was gunned up. Here are some pics of the new and old. The old one looks gutted. Does not have all the stuff the new one does, the old one also has initials and a reman date so it was rebuilt. Correctlly I don't know.

New
View attachment 1715794563 View attachment 1715794566
Old
View attachment 1715794564 View attachment 1715794565
The old one appears to be a distribution block only.