I would like to mix an MX-990i with an MSC-400 that is running one RFX-250 AND one RFX-250i.  Before I invest, can anyone confirm that there would be no problem using an RFX-250i with an non "i" MSC-400?

I ask because I noticed there is both an MRF-350 and MRF-350i base station - that is what is printed on its case - which surprised me a bit since I would think its the actual RFX-250i that made the difference and the MRFs would be identical.  Is that just a label to avoid people mixing them up?

Thanks
Ernie