The part of the plenum that bolts to the intake is the same, the TB hole might be different I have heard of guys having to port that hole out to get the larger TB to line up without a lip to disturb airflow, but only on the 70mm ones that I am aware of. But overall it is the same shape and diminsions. RJC sells the same PP for both plenums. If anyone is interested I have an extra PP for the accufab/KB plenums.