The only difference I see is the one at PB seems to be in 8 sheets that you put on the wall. The Target one sounds like one big piece map which may be harder to install. I am assuming they are both like vinyl that you just stick to the wall.
They are probably the same map with different packaging. They look identical and the Target description is just lacking extra info. They do this with a number of items, like their wooden fruit set for $24 is the Melissa & Doug one that retails for $20 and you can get on Amazon for $15.
And then add the trim around it like Centsationalgirl blog did.
The PBK one is dry erase - which might be nice with kids, but also makes me think it will look shiny (more office-y and less nice) and eventually you'll end up with dry erase marker stuck in the cracks between the sheets (which are visible even in their online pic).