Thank you, I can see that these are just .WAD files. That's why I asked - what Doom2 engine can I use with it and how? For example, can I use games/chocolate-doom to load and play? And how exactly can I load new .WAD files into games/chocolate-doom?
I really doubt anyone here can or will give you step-by-step instructions on it. Luckily, both of those ports have their own websites with extensive documentation. Failing that, I'm sure the port maintainer knows.