The MBP charger is 85W and the MacBook is 60W. Using a 60W on an 85W is okay, but you shouldn't be using an 85W in place of a 60W one for your MacBook. It may be fine now, but in the long-term you will risk damaging your notebook.
quick question. i dont do this but always wondered.
the 85w charger will only pull what it needs correct? it is not constantly pulling 85w from the wall? now if this is how it works, i dont see how it could hurt a 60w macbook. since the macbook only ever needs 60w?
now i dont do this, i do occassionally use a 60w adapter on my 85w mbp, very rarely though.
just a question