Was ist der Unterschied zwischen to differ und to vary ?Du kannst auch einfach Beispielsätze geben.

1) Vary is usually used when comparing more than two items together e.g.
'Regional accents vary in the UK' this suggests there are a multitude of accents in the UK.
2) Differ is usually used when comparing two items to each other e.g.
'The currency used in Poland differs to the UK'
3) I agree with tiramisu that 'vary' suggests a greater inconsistency than 'differ'. If I said 'My opinion varies', this suggests that my opinion sometimes changes. If I said my 'My opinion differs' this would suggest that my opinion is simply different, there is no implication that this is likely to change.