Can the core of Jetson nano 2GB be used on Jetson nano

Can the core of Jetson nano 2GB be used on Jetson nano

I don’t understand what the core is.
Do you mean to use Nano 2GB module on Nano 4GB carrier board?

yes

Yes, they’re pin compatible.
But we do not complete this kind of test to make sure all peripherals are OK, so we do not suggest and will not support the issue from this combination.