I'm not 100% sure whether the newer display hardware in RPi4 boards supports 3D either. I do know 100% that the original (dated) RPi4 boot firmware in the LE 9.2.8 image will not boot newer iterations of RPi4 hardware, although that's fixable if you manually update the firmware files in the root folder of the SD card to current ones.
NB: I have no interest in the Amlogic 4.9 kernel and have no patches of any kind for it, so you're on your own with that quest. I'll give you the heads up that once you start changing Amlogic BSP kernel versions you will need to re-hack Kodi and pile of other dependencies to align with the new kernel. In short, any assumptions you are making on interchangability are most defiinitely wrong, and a world of version and dependency pain awaits you. Good luck, and please don't post here looking for guidance on that direction.