What's the diff? ABS pump #148977 vs. Kit #70000774

Regarding my 1995 456 GT (2.7 Motronic), I'm trying to sort out the difference between Ferrari ABS pump p/n 148977 and the "pump kit" 70000774. On Ricambi America website it shows 148977 as the ABS pump for a 1995 F355 (2.7 Motronic). However, it also indicates "not as spare part; see kit 70000772".

That said, I see on eBay several references, including a chart, that shows that this is the same pump as on my 1995 456 GT 2.7 Motronic (as well as many other Ferrari models). However, most websites list kit 70000774 for the '95 456 GT.

Mechanic reports my pump is producing 150 PSI vs 1800 PSI required...and causing ABS light to stay on. I've posted on a different thread about this but wanted a separate thread to find out the difference between p/n #148977 and kit #70000774.

John