Question [Q] Possible to flash 4.3 with 4.2 baseband?

Is it possible to flash 4.3 but use the 4.2 baseband? I tried manually flashing stock 4.3 and checked baseband in the exclude column but it still updated to the 4.3 baseband.... so I tried flashing the baseband only from stock 4.2 to my 4.3 rom and no change.

Is this possible to do?