I think the worlds are nowhere close to each other:
SM feels like a US/Canadian Pacific coastal city to me, WC is a coastal Southern US city, OS is Arizona, NC is probably more a suburban city either close to WC since they share similar environment or SM simply for the city buildings in the backdrop. WB is clearly a German province, it's far too different in style from the others to ever be part of the same nation. BB is Maine or Nova Scotia, and FH is way down in the darkest corner of Eastern Europe, like Transylvania, so closer to WB.
As for vacation worlds, well GF feels like Rocky Mountains to me and SD is obviously an obscure Central/South American country.
