The Ripper/Grabber is based on the Marauder.
The first Marauder prototype were shown in 1974 and only went into production starting in 1975.
The first Rippers went into production and were being sold in 1973.
FWIW I don’t see any point of commonality between a Ripper and a Marauder. The body shapes are totally different and the electronic design shares nothing in common.
The Ripper and Grabber are also two very different basses beyond sharing the same body shape. The Ripper is a set neck. The Grabber a bolt on. Electronics are also about as different as it gets. Completely different sound and response.