Cruise mom4

Hello, I am travelling on Wonder with my family soon. We have 4 minor children, 2 are in a room with 1 adult and 2 are in a room with the other. Royal advised we have to buy 2 photo packages. My question is, could I buy a 100 photo package for one room and the 10 photo package for the second to save a bit of money. My question is how do they know or track who is in what room? Wouldn’t we just take all of our photos together as a family and then have access to the 110 photos? Would they really be able to limit the photos taken for the room that has the 10 photo package? Thank you!