The "weight" doesn't change, it's a characteristic of the font. What changes is the thickness of the glyphs (which for a given weight is more or less proportional to the height.
So, assuming you mean the thickness, the glyphs in 1 are thicker than those in 2 so you would be increasing the thickness of 2? And thus filling the loop of the "l", presumably.
So, assuming you mean the thickness, the glyphs in 1 are thicker than those in 2 so you would be increasing the thickness of 2? And thus filling the loop of the "l", presumably.