While it sounds like the same thing, it is not. Both techniques create inward palm pressure but the force is generated differently... Originally from the elbows, transferring down to the wrist, or with the PVDJR technique simply from the wrist/lower forearm itself leaving the elbows out of the equation. It's a subtle difference but to me, in dry fire at least, leaving the elbows more relaxed feels better and more natural, but I have yet to try it on the range to see if it makes a difference.