Originally Posted by Sy Reene

I guess so, but at the same time I'm thinking how different these 2 tires's sizes could be considered different if you think of the shape as more ovalized.
Nominally, you could quickly (incorrectly) think a 27mm inflated width tire is only 4% greater in size than a 26mm tire, but with an ovalized area and the height differential, it grows to perhaps about a 12% difference. Since the various tire pressure calculators don't include height, the ballparks can be quite large in size.