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
20210922_194036.jpg 20210922_194408.jpg
Old
20210922_194059.jpg 20210922_194251.jpg