SPYDER-BAC License/Module and versioning

I have a site with a Lynxspring jace 8 and lynxspring edge devices on some RTUs and the failure rates are bad so I'm going to replace this next one with an Optimizer Unitary.

The catch - this jace is only licensed to 4.12 and it is running 4.9. So for reliability sake it'll either keep its 4.9.1 or I may commission to 4.10's last release.

I'm sort of new to honeywell - and i'm curious - is there any reason the IRM stuff won't work on an old version of N4 with an optimizer unitary? I know the unitary isn't super old so I was just wondering if anyone knew that for sure there was a minimum N4 version required for IRM to work with a unitary or not.