Can you tell the difference between (a) and (b)?

Question

(a) East Asians- Chinese, Japanese, Korean

http://www.quickmandarin.com/images/learnchinese-yao-headshot.jpg

(b) Southeast Asian- Indonesians, Filipinos, Malay, Cambodian

http://www.phototour.minneapolis.mn.us/pics/4449.jpg

Answer 1

A is wearing a suit. B is dressed more casually.

Answer 2

Tell the difference in what way?  Physically?  Yes...