Hello, I am trying to decipher the difference in the following abbreviations, or if they actually mean the same thing just written differently?

Hello, I am trying to decipher the difference in the following abbreviations, or if they actually mean the same thing just written differently?
These are all in three different baptism records I am trying to figure out:

Ps (sorry, the “s” is supposed to be written as an exponent character, but can’t find that option on my keyboard)
P. nos
P.P.

I know P.s is for padrinos, and P is for padre, but trying to figure out these other ones and how they all fit in.

If anyone can help, I would be most grateful.

Thank you!