The devices aren’t the same type: FaceDeep 5 and FaceDeep 5-IRT. I think it could be the reaseon of incompatibility.
Anyway, the firmware 03.72.xx was discontinued and the latest version you could upgrade to is 03.72.AQ. Give it a try with this firmware, please, ask the support team for this firmware version here: https://support.anviz.com/hc/en-us/requests/new
In the case of the incompatibility between both models, I supose it wuld be the same case for FaceDeep3 and FaceDeep3 IRT; I mean, the templates of each device, cannot be uploaded to any other, is it right?
Regarding the update to the latest firmware, the version 03.72.AQ is available for both models?
You can try another way: export the templates (Data→Export menu) to a pendrive on first device and then import them on the second device using the pendrive. Maybe it will work.