I'm thinking of getting a winch for my terrano, and will probably build a custom front bar to suit (may be a while before I actually get time to get this done tho

Do all winches have similar/same sizes and mounting bolt pattern/style?
Or are they all very different?
Like if a front bar was made to suit eg a warn winch, could a runva, tigerz11, superwinch or chinese cheapy etc bolt in to same mounts?
Cheers,
Nathan