map converters for doom64ex format?

Since there's map converters like for example for Doom to UDMF format and vice-versa, is there's any for Doom to Doom 64EX format or is there simply some code I would need to change in a original Doom wad via Slade to work in the Doom64EX Builder?

It's not that simple, because everything is different. The textures. The thing dimensions. (An imp might get stuck in a wall, because D64 imps are huge -- even wider than D64 barons, as strange as it seems!) The way textures behave. Linedef flags and specials. And so on.

Yeah but I only want the basic wall and secter data that both editors have in common to be converted, I wanted to try and retexture and modify the architecture of certain old Doom maps to see how they look in Doom 64EX and I don't want to have to individually change the wall and sector data (I'm fine with doing this for the textures and architecture) one at a time, I can copy a maps wall data directly from Doom Builder 2 and paste it into Doom64EX Builder while they are both running but it won't include the data things like (impassible, doublesided, etc).

Since I do not know anything about DoomEX64, nor do I want to, this is only a suggestion:

Have you tried to copy/paste maps between Doombuilder2 and Doombuilder64.
If that does not work, try prefabs.

Copy and paste works.