I suspect this has come up, but after the comments on Exchanging Albanian Money Into Euros Outside Albania, wondered if we could clarify here.
exchange is a synonym for exchange-rates - that is, any exchange tags get converted into [exchange-rates] tags. However, they were both separate at one point, even having a tag wiki for exchange.
When you consider the question at hand, I would have thought that really it has nothing to do with exchange-rates - he just wants to exchange them. I briefly considered unsynonymising them, but figured someone may have had a reason for it that I'm missing.