There is no actual difference: the preposition "except" means "except for" (the double preposition is also seen in but forand as to). The use of "except for" to mean "were it not for" is rare in modern English (e.g. Except for the cost, wind energy is a fine idea.)
The word except is also used (much less frequently) as a verb, meaning to leave out or to exclude.
no difference, except price.
no difference except the name
There is no difference except the words you use to describe them.
There is really no difference .Except that the other on costs more
There is no difference except that tween is considered more of a slang word.
There is little difference except mastic means 'from plant origins'.
The difference between the desgineer and engineer is the math. They both do the same thing except the engineer does the math.
No difference except that one is UK English and the other is US English
There is no difference except for the colours and design.
There really is no difference, except that anyways is an informal or dialect form of anyway.
No there isn't really a difference except for its color and boxing
Nothing...except for the price ;)