Stroke weight is the one thing that can't match, and it's the render engine, not the font. Measured at identical size and resolution, the front-end column carries ~1.5× (italics) to ~1.8× (dense upright caps) the ink of the LaTeX column - and that ratio is identical whether the FE font is Latin Modern Math or the FE default, so no font choice changes it. MaTeX is a resolution-independent LaTeX vector; the parser column is front-end-rasterized text, which is simply heavier. Equalizing it would mean rendering both columns through the same engine - which would make them identical and defeat the comparison. It reads closest in light appearance.