Depends. As has been suggested, did the pro pickler have previous tennis experience vs a pro tennis player who never pickled? That doesn't seem like a fair comparison.
You'd need to pair similar levels of experience across the alternate discipline. Pro pickle with no tennis background vs pro tennis with no pickle in his pocket. Or pros with 2 hours of practice.
If this is the case, you know you don't need to be a pro level tennis player to crush a newbie tennis player. Your average 3.0 pusher should blank a newbie with 2 hours of lesson.
On the other side, a pro tennis player, with thier level of athleticism, give 2 hours of pickle practice....they should still lose badly, but I think they would get some points.
It's been said before, the biggest appeal of PB is the short learning curve. 10 minutes of practice and a decent athlete can play with most any group of rec PB player. 10 hours of tennis lessons and a decent athlete is still gonna get crushed by an average 3.0