At least in the US models of the Fit there's no difference in the interior trim levels. I think part of the confused nature of this discussion is that Honda never shipped the touch-only dashboard that this article is talking about in the US market. The Fit and as far as I have seen every model Honda sells in the US has always had real knobs and switches for the climate controls. The touch climate controls were available in Japan and elsewhere.
For the 2016 year model, the base model has a volume knob but the higher models do not. The 'USA interior' link above seems identical to the Non-USA link vs audio volume knob not being there.
This is what the dash looks like for models with the knob (could only find 2015 lx but looks identical to 2016 lx):
https://cdn.jdpower.com/ChromeImageGallery/Expanded/White/64...