yes that obb..
for the google, i did these :
connect google using original apk > relaunch app and use guest login > go to the same server as google, it will be the same account.
install the mod, login with guest and play
do not update it before you copy the obb file. here is the step : install > give permission > on update pop up choose exit > copy obb > relaunch > update and play.
thanks me later