Personally i'd say no, even though you might think nothing will happen between them, your can never be to careful. They are differnent species or reptile, and yes, some species might have the same diet or same enclosure requirements, at the same time they are seperate species, they probally don't even want to be with each other.
Gecko-mad: please listen to what others are saying, they are only trying to help.
and other people please don't try and put other down or be sarcastic, im sure geckomad meant no harm, and was only asking a question he didn't think through.