Nectarines and peaches are very similar, but slightly different. Peaches are fuzzy where nectarines are smooth. I think nectarines tend to be a little sweeter, as well.
Also, tbh, peaches and I have a lot in common in that we both bruise if you so much as tap us.
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fact: i thought of this because i saw a can in the store today
wikipedia mentions that canning it removes the flavor in the first three sentences