Permanent residence permit (P) vs EU residence permit (P-EU)

Hello! I tried looking for the differences in the migri page but didn’t find much about the definition of the EU one. Just how to apply and the requirements. Basically I live and work in Finland but perhaps I want to spend longer periods of time somewhere else in Europe. Wondering if the P-EU would help now that I have to renew my P permit… I hope this is enough info. Thanks!