should be able to tell by looking at the screw heads. From memory pozidrive have parallel sides philips are tapered. I also think there is an idenitifying mark on one of them, but forget what the mark is and which one has it.
pozidrivs shouldn't wear like that if you use the correct driver. looks like a too small philips was used. The trouble I've had with pozidrives and very tight screws is snapping the blades on the driver. you can get that much torque without it coming out. And I have a feeling both those screws are pozidiv, there doesn't seem to be any taper on either
