Oh, I think so
From the Beseler 45M brochure:
"
Beseler Enlarger Model Code
45: accepts negatives up to 4" x 5" (from 8mm).
M-Motor: automatic electric motor raises and lowers lamphouse.
C-Colorhead: Bescolor Colorhead accepts color filter material between condensers.
R-Resistrol: Resistrol Unit varies voltage entering enlarger lamp-up to maximum line voltage.
X-Rear Support Truss: Extra reinforcement rear baseboard extension.
AF-Automatic Focusing.
B-Beslite: Lamphouse with cold cathode grid light source instead of condensers.
AG-Beseler Agfa Colorhead."
Admittedly, these are a bit old, but I think the system still applies. I'm not sure what the "T" stands for o the newer MXT, but it must mean something.
Best,
Doremus