Correct. My 750w G2 are setup similar to your PSU2 above, CPU to 2x 6pin splitter and using 1 molex string per riser.
(I had spare EVGA G2 molex cables, and on the PSU side PERIF/SATA sockets are wired the same)
So I can use the Perif - Molex cable in the SATA plugs on the PSU as well?