The right side is right (-handed threads, so righty-tighty, lefty-loosey when facing the right side of the bike).

The left side is not (it's left-handed threads, so righty-loosey, lefty-tighty when facing the left side of the bike).

When the bike is upright, and a pedal wrench is upright, then for BOTH pedals, turning the wrench towards the front of the bike is tightening (to get the bike ready to ride (forward) you should tighten your pedals), and turning the wrench towards the rear of the bike is loosening)

If you think about it, these mnemonics agree with each other.