They're essentially the same thing, as 24C says?
The pitch being the amount of rotation of the a/c around the pitch axis.
The 'attitude' (or 'pitch attitude' if just considering pitch) is generally the term used for how this rotation is viewed by the pilot with ref to the horizon - i.e. what is seen through the window (or on the AI) for any given pitch amount.
[not the most eloquent definition I know]