yes,its possible.several people including me have tried it and it works.afaik,the only difference is the nfc and smaller battery on the U8818. as with all flashing of roms though, nothing is guaranteed.do a cwm nandroid backup of your existing rom first.
also, some roms from huawei such as B888 using the dload/update.app method changes the bootloader and the partition table, and so far there is no way to go back to earlier roms. check out modaco forum on the g300 for more info.
Sent from my U8815 using XDA