Can Delta faucets and such for bathrooms be replaced with different brands of faucets

Depends... If you want to replace sink faucet than the only limitation you have is the number of holes in your sink. As far as tub and / or shower faucet goes - here you are more-less limited to the brand ( here you can upgrade trim only ) - unless you are willing to cut open the wall and replace the rough-in ( body valve ). Than, your choice is unlimited. Hope that answers your question. Milo

Sure they can. They even have remodel plates where you can replace a two knob valve with a single handle one. Good luck, Tom