Is there any difference between "HK" version and china version? is it safe?

view story

http://forum.xda-developers.com – When looking for galaxy note in china, I was told in several shops that they sell the china model of note 2 for 5199 RMB but if I want a cheaper one, I can buy the Hong kong version of the note 2 which is about 4300-4700 RMB which is a huge difference. they say that the only difference is the price... Is there really a HK version? I actually spent 1 hour checking the device to see if it is fake and couldn't find any clue for this. I own a Note 1 so I think I know what to look for. Why do you think there is a huge difference price wise? Is it safe to buy this "HK" version? (HowTos)