Same brand, timing, latency and voltage -- the only difference is size. I have a P7P55D Pro.
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More aboutupgrade compatibility gskill 12gb gskill
You have done your homework obviously. Such an upgrade should work perfectly. I say should because sometimes, and inexplicably, nearly identical sticks don't work together, but fortunately that is the exception; you should be fine. Go for it!
Confirming that this should work. My Sandy Bridge system has one 2x4GB and one 2x2GB kits (Ripjaws X) for a total of 12GB.