HL7900 and HL7812, what is the difference and which one supports NB-IoT-NTN?

IoT Modules
1

Does HL7900 support NB-IoT-NTN? What EVB kit/Dev board is compatible? What is the difference between this and HL7812?

2

You can see here for the dev kit

https://source.sierrawireless.com/resources/airprime/development_kits/hl-rc-development-kits/

You can see this for the difference

BTW, future release firmware for HL7900 will be supporting NTN functionality.