Megan doesn’t look that different to me. Yes the nose and lips but the brow, eyes and chin are largely the same. Aside from no glasses and a lot more fake tan & peroxide.
Kylie Jenner, however, looks like she’s had a head transplant. Everything looks different. The width of her jaw, it looks more square (I suspect some sort of chin job). Her eyes, they look more round and ‘open’ (could just be better make up, circling eyes with kohl does tend to make them look piggy). The nose, slimmer, longer and with the ‘snub’ at the end gone. Lips fuller, particularly the top. Not to mention several shades darker in skin tone. Like two different people entirely.