Default Building a Custom Rom for i9508

Currently, there are no i9508 custom roms available. Since i9508 differ from i9505 in terms of baseband (i9508 has no LTE, and has an extra 3G band for China), could I download a custom rom for i9505, delete the radio from the rom, and flash the rom onto my i9508?

I've read that radio is not required component of a custom rom.

In addition, should the kernel be the same for both versions?

Thanks