What is the difference of NB-iot for 4G and 5G?

Hello Experts.

What is the difference of NB-iot for 4G and 5G?
Is it similar or is there any critical difference?

One of the critical difference is that NB-IoT in 4g comes as a separate rat with different channels and it’s processing and in 5G it is same.
Therefore if you see any 36 series specs (LTE) it will have a different section for Lte and different section for NB-IoT but in 5G mMTC is one of the 3 use cases that’s it.