Ok, it turns out I was way off in my original response. Here's what I get for trying to go on memory. I also somehow misinterpreted your question as being about the MS-9600, not the 9200. Just as a note, the MS-9600 does NOT use a plug-in transformer, but has a separate FLPS-7 power supply.
It appears the last poster is right, there is a difference between the two transformers. XRM-24 is for the earlier versions, XRM-24B for the more recent. From looking closely at images online, they use slightly different pins and won't plug in if you don't have the right one. They seem to have almost identical electrical specs, but I'm not sure I would take the chance since they intentionally made them non-interchangeable. According to this
Note that the XRM-24B and XRM-24BE are only suitable for use with MS-9200UDLS(E) with a main circuit board assembly number 9200UDLS-PCX
Rev Y, where “X” and “Y” can be any letter or number. This circuit board can also be identified by using the software revision of #9200UDV4.0 (meaning version 4.0) or later.
You can also look at where the transformer plugs in. If it looks like the top diagram below then it uses the XRM-24. If it looks like the bottom then it uses the XRM-24B.
XRM-24: | ·· · ·|
XRM-24B: |· · · ·|