Canon edible ink 251 Cyan XXL

Q: I want to order some edible ink cartridges for my Canon MG5520 - and I see "XL" and "XXL" on the cartridge names - I don't recall having seen that before - before I place an order, I would like to know which are compatible with my printer - and what does the "XL" and "XXL" mean if they are, indeed, compatible? Thank you!