SMC-FA versus SMC P-FA

Is there a difference between these two lens types - i.e. with the addition of a P in front of the FA?

unless I am much mistaken, the P simply stands for Pentax.

All Pentax lenses since the introduction of the K mount are either

SMC Pentax -(series designator) (Lens name)

or

Pentax - (Series designator) (lens name)

if they lack the SMC coating. (this is rare, I only know of 5 or 6 examples across all series).

So correctly all FA lenses are SMCPFA lenses, but mostly we get lazy and just refer to FA lenses.