For some reason, I think the RoA tins are actually slightly bigger, but yes they can...or could, I don't know if they can hold the wider TEC cards while sleeved without being too snug.
Regardless, I don't recommend it because it damages either the edges of the cards or the sleeves they are held in, and it can be a pain to pull them out.
I recommend just investing a couple of dollars in cheap plastic deck boxes, at least.