They share overlays as DT is a common language describing the hardware. They don't share modules
[email protected]:~ $ ls /lib/modules/ 4.14.50+ 4.14.50-v7+ 4.14.50+ is for Armv6 and kernel.img, 4.14.50-v7+ is for Armv7 and kernel7.img. Thank you very much for this information! Don't know how I missed...