They're not the same unfortunately. The P5 cable has a straight plug whereas the P7 cable has a curved plug. Both are 2.5mm but I think it would be difficult to bend the P5 cable that much in order to fit into the P7. The P7's cable also fits much tighter.
Left is P7, right is P5:
I'd like to buy the P7 standard cable to plug it on my P5.
Do you think it will fit into ?
Edited by Neokimo - 12/29/13 at 2:36pm