i know about the kodi side, but if you use gmail and set box up with gmail it should put all apps that you got from play store on new box
you can make a kodi backup . thats a copy of your kodi complete with all your kodi addons and settings . in theory then you can use a kodi program to send that backup into another android box . which means (kodi wise) that that box is identcial to yours . i would say that with backups that its best to use the same version of kodi , what i mean is if you put your backup copy of kodi in a few boxes that you first install the same version of kodi that you have . the reason being that kodi changes over time , files that work fine in an older kodi may be incompatible with a newer or latest version . i dont recommend using wizards etc that install lots of addons or apps . they can install a lot of unwanted , broken or useless stuff . remember with these boxes conserving memory use is vital .