First ones are eyed, the other pack are spade ends. Think the packaging has changed which is why they look different.
I've seen it said that there is a slight difference in the wire strength but I'm not sure whether it is enough to be noticed in normal use.
You didn't buy in error, they're a 16 spade with an eye. The packaging changed so that customers (and sellers) don't get mixed up between the two. There's been a few times when this has happened as both had the same colour packaging.