I've only seen the Ripper with that early body shape. My belief is that the Grabber does not exist with this shape, at least as a production model.
According to
Grabber shipping figures there were 200 or so Grabbers shipped in '74, and one in '73. The
'75 catalogue was printed in late '74, and the new body style is shown there. They don't show up in price lists until Jan '75. I have Gibson letters from Dec '74 describing it as brand new. So I feel the '74s were built right at the end of '74 and had the new-style bodies.
But the one in '73 (if it actually exists) was presumably a prototype Bill Lawrence made at the same time as he did the Ripper, potentially with the old shape. Prototypes were usually done in racks of 8 if they were to be shipped/demonstrated, and there was a long wait until more were made in '74. Furthermore, a patent application for the Grabber was filed in Aug '74 under Bruce Bolen's name. So I do have my doubts about this one being real, or at least being something that was actually shipped to a customer. If it does exist, it may even have other early Ripper features (set neck?). Did Bill just design a sliding pup, and suggest it for a new model?
The earliest Grabber I have a record of with a black headstock was a 6 digit, most likely 1975
The latest Grabber I have a record of with a natural headstock was an 8 digit, very early 1978
So in summary, IMHO Grabbers didn't change much, and with the exception of different finish options in the early eighties, but to be proven wrong would make my day!