Ah, good - only three replies, and we have two different opinions already. Which isn't bad, considering that one of the three replies didn't answer the question in any case.
I feel justified in being unsure on this one now!
KitKat, my gut feeling is to go with Dorosenco on this one. The "PP" and "CP" bits appear in the "license number" field of my JAR licenses, so I think they are part of the number, even though the numeric part hasn't changed. And the "PP" bit which is printed on my FAA license is incorrect - if an FAA inspector asked me to produce a valid JAR license with the a number which matches that shown on my FAA license, I couldn't. I hope that someone can prove me wrong, though, because I have no plans to go to the US at present, which makes visiting a FSDO a little difficult. But, on the other hand, I also have no immediate plans to fly an N-registered aircraft, so it's only a minor niggle rather than a major inconvenience.
FFF
-------------