I have several of these P6015 and P6015A and used both of them with a P6015A compensation box and it works very well.
On the other side, I have never used a P6015A tip with a P6015A compensation box but I see no reason, why it should not work.
If you are using of of the older P6015 tips, make sure it is filled with some FREON, otherwise it is very much limited in voltage and easily damaged. I still have two P6015 filled with FREON for many years already and the liquid level seems to be very stable.