Are boss drops exclusive to the respective boss chest? Or can the loot I'm farming from that boss be just as obtainable from the minion chests?
I'll assume you're talking about the standard loot chests that show up after a boss fight... and then the "boss chest" that also appears. Typically, if there's a specific item you're looking for that a boss drops, that item can be dropped after the boss fight. The "boss chest" is there to offer you extra chances to get the item while you're there, without having to do the instance again. Theoretically, anything the boss can drop MIGHT be in the loot chests or second chance chest.