Question about back counting DD

I dont have access to my bjrm right now so can someone answer something.If you back count a DD game with 50% pen, do you have the same advantage when you come in at +3 or +4(1% advantage with my count)compared to if you came in at +3 or +4 with 60 to 65% pen on a dd game somewhere else.rules would be the same.h17 das da2.