I have some old NM-4T modules in a 3640 that need to be moved into a new 3845. I have had a quick search on CCO and it seems these are compatible so I should be OK. However the NM-4T modules are quite old - 'show diag' says 'Mueslix-4T Port adapter', 'Hardware revision 1.1' and 'Board revision J0'.
I remember a while ago where we had some NM-4T's (I think?) and they would not work in the routers we had - it could have been 3700's though?
Can anyone who has performed such a swap out confirm whether the NM-4T is compatible with a 3845?