No. Misremembering naming and product changes from over 30 years ago.
Remember that OSF/1 was an attempt to win the UNIX wars.
The later versions of ULTRIX had lots of BSD4.3 features that really made the move to ACP based systems feel more like a silicon change than a new OS from an admin perspective, even if not mach based.
Anything that ran bind and pop was running a later version with the bsd4.3 TCP/IP stack.
