Find out if two columns are the same

Hi!
I have two columns A and B with quite a lot of values, some of which I had to write myself, and I'd like to be sure they are really the same: I mean with the same values in the same cells. Is there a way to check it and, if the two columns are different, highlight the differences?

An example:

A B
1 1
2 4 highlighted
6 6
3 3
5 2 highlighted

Thanks!

Yes, but probably I do it wrong, because it doesn't work...

Not hot on CD, but you could use this in Column C and copy down.

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