DBC's can be used from anywhere, these are blizz directly exported files.
Maps, vmaps and mmaps are marked with a version to allow to cores to identify the core they are loading. Also there may be changes in the formats also by other emulators. If fact, mangos implemented several precision improves to the extracted files several years back which as far as i'm aware have no been incorporated into their codebases.
To ensure the fastest extraction build, always build in release rather than debug. I do not have a monster PC, but I was able to build the cores, extract all the files and load the databases for MangoZero, One, Two and Three in an afternoon.