I can not actually find out who came out first. Both singles were released in 81 or 82, but one of them sampled the other obviously lol.
I think De La sampled the Whatnauts, but that is another thing I have not found a real answer for on the net lol.
Im sure someone knows the answer to all of the above on who sampled who, but I take something simple like this search as a good reminder that no one source on the internet is usually correct. Always search for confirmation if something seems interesting and truthful! I would apply that more so to things outside sample moments though lol.