No differences between autohinted and no hinted font

I exported two .ttf fonts one with TTFAutohint options set and other unchecking the “Autohint” option.
I notice a difference between both exported files in the file size but any difference in the rendering of the font, not even a tiny pixel movement.
Any ideas?

Where are you testing? Adobe apps or Windows browsers should show a difference. MacOS ignores hinting altogether.