Hey, I'm not sure what the difference is between the written characters, but you will probably never need to write this character. (Unless you are studying ancient Chinese or something, in which case you wouldn't have asked this question) It is an ancient characters that is rarely seen, and means the same thing as 国 Here is some information about it: http://baike.baidu.com/view/719471.htm?fr=aladdin Anyhow, hopefully this answers at least part of your question.

they are two different characters,,,first is mouth,,u can see it is smaller,,,,,second one means country,,,u can see it is a little bigger,,,and the second one,,it is not very common in daily life,,i mean most peploe don't know it,,,,,and not using it,,,,,but if u search the dictionary u can find it,,,,,

размер... 口 пишется отдельно или как часть иероглифа например 命, 語 и т д, а 囗 сам отдельно не пишется и является внешней "оградкой" иероглифа например 四, 园, 圆 и т д

Well,I haven't used this character "囗（wei）". We seldom use it.

Sorry I don't understand. You don't want us to reply on the computer? How do we reply then?