There will be some "noticeable" differences around the perimeter of the two lands, but I think these differences will really be quite minor in reality. Will having two smaller tunnels 30' apart really be all that different from a single larger tunnel? And what difference will it ultimately make to the meat of the land itself?
Typically when Disney "clones" something between the parks, there are a variety of differences between the various versions. Consider attractions like Splash Mountain or Big Thunder Mountain, which appear in multiple parks and have a lot of similarities, but also have a different ride layout and unique elements in each incarnation. Even attractions that were developed for simultaneous installation in multiple parks (TSMM in DCA and WDW; Buzz Lightyear in DL, DLP, TDL, and HKDL) have unique factors to fit their respective locations as needed. The big exception to this is TDL's opening day structures, which were largely copied from MK and DL because WED was too busy creating EPCOT Center to devote any real designers to the project.
It's even more unusual that the site design is copied from one location to the next. Site design is influenced by a much larger number of factors, including crowdflow and size, utilities and grading, emergency access, and overall park menu. Sure, all the castle parks have a Fantasyland with the classic attractions, but the layout, configuration, and even attraction roster of each of those Fantasylands is quite different from the next. The closest thing we have to a cloned area is either TDL's Tom Sawyer Island (copied as a mirror image from DL, but the outer riverbank is quite different) or HKDL's Main Street (façade architecture copied from DL, with new paint schemes and all-new interiors)
Yes, there will be some differences around the edges and approaches to the two Star Wars lands, but the overwhelming majority of the 14 acres will be identical. This is a copy-and-paste on a scale that Disney's never done before, which should not be understated. As someone who spends a lot of time doing site design, it's fascinating to watch how they're copying things on such an unprecedented scale