Youngmin is older than Kwangmin by 6 minutes. Youngmin also likes to sleep a lot. Kwangmin is more quiet, but in my opinion, he is kind of crazy, but in a cute way. Youngmin's ideal type is cute girls, Kwangmin's ideal type is like clumsy(?) girls...(maybe clumsy, like cute clumsy).
Here are a few differences:
Their jaw-lines are different. Kwangmin's is sharp, and Youngmin's is smooth.
Youngmin is more talkative than Kwangmin.
I think Kwangmin has a deeper voice than Youngmin. That's about it. :)
Youngmin's eyes are bigger than Kwangmin's eyes
Kwangmin's jawline is sharper, and Youngmin's jawline is smoother. So Kwangmin has masculine look while Youngmin has feminine look.
Youngmin's neck is a bit longer than Kwangmin's neck. So that's why sometimes Youngmin looks a bit taller than Kwangmin.
4. Adam's apple
Youngmin's Adam's apple is a bit bigger than Kwangmin's
Kwangmin's voice is a bit deeper and lower.
Their smiles are different. I can't tell the difference, but I know they are different just by seeing their way to smile.
Their lips are different. I can't tell, but if you look at them more closely, you can see the difference.
Kwang Min is the one with the eye close. They look exactly alike, but if you look carefully, there is a differences. Their neck and jawline is different. Kwang Min's jawline is sharper than Young Min's.
Kwangmin's jawline is wider than youngmin, kwangmin has mole on his cheek while youngmin's on his neck, kwangmin's voice deeper than youngmin's. Their attitude are totally different. Youngmin's childish and Kwangmin's 4D.
it's their face-shape , Kwangmin oppa's face is chubbier than Youngmin oppa, their eyes too .. oppa YM have a bigger eyes than Kwangmin oppa and their height also , cause Youngmin oppa is taller than Kwangmin oppa .