I tested it, G928G MM Bootloader works on G928I.
I tested it with this [ROM][SM-G928 F/I/C/L/K/S][6]Ditto S7 ROM [v6] from Electron Team[PC8] Thanks to GigilinE
Take a look at Attachment!
TAR File(sboot.bin, cm.bin) flash via Odin. (For install a ROM you need Recovery and Kernel for MM):D