Jim Adney wrote:
That's correct. Both Phillips and Posidrive are registered trademarks
of the Phillips Screw Company. They are different, but they should
interchange. Posidrive is the better one, however.

The best way of ruining screws and screwdrivers is use a standard
phillips screwdriver in a pozidriv screw and vice versa. It will work,
but if you need to apply force, the screwdriver will force itself out of
the head. At least in my experience, that is.

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Met vriendelijke groet,

Maarten Bakker.