Are Porsche 911 bumpers for 1975-1977 much the same as Porsche 930 bumpers 1980-1987?

[Diggem]

I am just wondering if Porsche 911 bumpers from 1974-1977 are the same as Porsche 930 bumpers 1980-1988?

I know the bumper extensions are different but what about the bare bumpers themselves?

[DRACO A5OG]

Fronts, yes in 86 they added the cut out to allow air to flow better into the carrera front oil cooler and in 84 the the impact strip is shorter

Rears, the form changed in 84 I believe as the bumperettes are different.