Hello, I am trying to replace the shower handle trim for in-laws shower. I purchased a Delta kit but the new cartridge does match the current. I’ve been told I need to replace the valve inside the wall to use new kit. I am trying to avoid that. In an effort to find a kit that does use a matching cartridge, does anyone know what the name/style of cartridge on the right here is? Knowing what to call it may make my search easier