Are Apple's power supplies interchangable?

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apple's got 90, 60, , 45 watt psu various notebooks (unless have larger i'm not aware of).

and...all 3 cost same price.

i'm wondering-are interchangeable? system comes 45, can use 90? or 60 90?

i'm thinking if they're compatible, there seem no reason me buy 45 watt psu air (or 60 13" pro) if 90 works, might able use 90 on more systems down line?

edit: sorry, should clarify know shouldn't use smaller 1 power larger one, hoping okay use larger 1 power smaller one, if makes sense. wasn't sure if apple used same connector, or doing else weird, sounds they're same, can buy 90 air or 13" pro!
 

i don't think so.
 


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