Are all shower rough in valves the same?
Considering this, are most shower valves universal?
Typically the valve you want will be R10000-UNBX or R10000-UNWS. They are all universal and all Delta Shower Trim Kits will fit every single one of these valves.
Just so, are shower valves interchangeable?
First, you absolutely CANNOT mix manufacturers on trim and rough-in valves. In fact, even within one manufacturer, they have many valves and the trims are not interchangeable. Shower sets are not always sold as separate trim and rough. In hardware stores and home centers they are almost always sold aa a complete set.
The universal Delta Tub/Shower Diverter Rough-In Kit enables you to make easy changes to your shower's function, style and appearance without altering the plumbing behind the wall. It has a forged brass body for durability and works with 3- or 6-function diverters. The trim is sold separately.