There is no CRJ9 type rating. What you referenced is for ATC, not pilots. That is what shows up on the controller's screen so he knows the performance capabilities of the aircraft.

My type rating says CL-65 for the -200 and -900. So I am going to put CL-65 in my logbook. However, it is YOUR logbook, so put crj900, cl65, crj9, who cares as long as you can explain why you did it. Who knows you might be applying for a job where they want to know your total jet time of an a/c with MTOW over 55,000 lbs, it would be nice to differentiate them . My biggest pet peeve going through interviews was the HR guy that would ask me why some of my logbook entries were in blue ink and not all black ink. Because it's MY logbook buddy, plus the instructors put some entries in there too.