Nie, thanks for the comparison of the two kits, and the picture showing the bodies of both side-by-side. They do look to be pretty much the same in terms of proportions. My understanding of a curbside model refers to no engine, chassis or interior detail. These days, most people refer to a car with no engine detail as a curbside.
First off, welcome to the Forum Paul. I'm like you in that I have many started but few finished. When I see a finished model, my eyes are always drawn to visible mold lines and parts seem lines. Call me crazy. LOL Something like an out of box build is finished at the comfort level of the builder, so may or may not be important. The completed model that do puzzle me are the ones that are immaculate ... paint, fit, finish, details ... however no seem/mold lines have been removed from radiators, engine blocks, transmissions, exhaust systems and so on. If the builder went to theses lengths to achieve realism, why leave behind blemishes that give the finished model a toy-like appearance? I know, I know, this has been covered a million times before. And of course, this is my take on things.