Originally Posted by t3tr1s_
I'm confused, can a 4.4.2 ROM only be on a 4.3 BL?
Yes, it sure can.
If you're fully upgraded to the KK package completely, ex: through odin, you have to use a KK rom that has the 4.4.2/Kernel bootloader components.
If you don't fully want to commit to KK completely you can flash a KK rom that has a kernel with the older boot loader. That will allow you to go back to 4.3.
I suspect given time, 4.3 support will be slowly dropped in favor of a full KK implementation on this forum. In the transition period, be careful what you pick and choose to install.
I, like many others, have gone full KK inc. bootloader, etc for full compatibility with everything. When you go full update, you get the updated firmware and bits for the modems, etc.
Current Phone: TMobile Galaxy Note III
ROM: Rooted "stock" NF1 kitkat
Current Tablet: Nexus 7 (Rooted stock)/Microsoft Surface Pro 2