Absolutely. The PPP is unique and it's not even a proper fell race with all that fast road and track.
But we are comparing apples and oranges
Personal anecdote counts for nothing. The records show the PPP taking 27% longer for men and 24% longer for women: all class performances.The PPP women's record is held by Pichrtova who was at the time the best mountain runner in the world. And she beat the wonderful Angela in the same race who currently holds the FTOP record.
And if I may be allowed a person anecdote: I have done FTOP in under 3 hours (in my mid 50s) but my best PPP time (10 finishes) is nearer to 4 hours.
Relatively: FTOP is a walk in the park, but with weather. The PPP is a fast road race but with three hills thrown in to wreck your rhythm.
Apples and oranges.