when dealing with white labels with no info on label or cover, best bet after actually listening to the songs would be to see if there's anything written in the run out grooves. but if there is anything in the runout groove, it's usually very vague or be a very common cat # and could belong to any number of releases.
damn, didn't see the links to audio on there. sounds one side is just one mix, and the other side is a remix. always helpful to have the complete song so you can pick up the hook or some other reference to what the song could be. serch4beatz is insanely good at song ID's.