Deja Vu!
I bought a jamma cab this weekend that was said to be a MK2. It did have a MK2 marque, but there was no art. Upon closer examination it has side art that was painted over. Under the paint was art that wasn't MK2. Not exactly sure what it is, but preliminary searches I believe it is a Double Dragon cab.
The cab came with boards for MK2, DD1, DD2, and POW.
Sorry I can't help. I just thought this was a weird coincidence.