I don't recall seeing those ships either. But there's only been 1 episode so...
It's a 2-D issue/hand-drawn issue. Most animation these days use some CG whether in scenery, coloring, or even full animation, CG is a cost cutting solution so I expect things to look different.
On that note, the Island 1 module does look bigger, which may account for the fact that it is a larger population and less skyscrapers, i.e. dome is taller so everything fits underneath. M7's population was only in the hundred of thousands. M-Frontier's population is in the millions (I believe it was close to 10 million or something in that range).