In short... it is the yongnuo's... but only one of them. Only one works as a transceiver... the other only works as a receiver... So I labeled them with a black permanent marker...
Get out the 1/4" plastic colored tape and do a strip around it.
We should put this thread on the 'things to consider when purchasing speedlights' faq. Nothing against the Yongnuo's, but mix and match and having to figure it out based on model numbers just isn't my idea of fun.
Hope you found a way to reward yourself for brain teaser.