Center同Centre

Center and Centre have the same meaning.
Center (American English)
You'd better use 'centre' in Hong Kong instead of 'center' unless you work in an American company.

center is American English
centre is traditional English

一樣用法～其實係同一個字
只不過centre/center係英式美式串法不同

就等於realised and realized 都是英美式串法而已

Same.

Center is american spelling and Centre is british spelling.