They are different. If you want the pinout for the P0, the best reference is the open-source Photon design, which uses the P0. The Eagle CAD schematic lists the pin numbers on the P0 part.
Trying now to convert my design with p1 to use the P0 due to the component shortage.
Just to make sure - they need to be Particle sourced.
USI’s own “P0” (BM-09) won’t be commissioned for Particle cloud access.
I intent to buy P0 from Particle … its the only thing left in stock.