Yeah, insofar that the songs on it all sound like they were written as one set ('I Am The Walrus' being the exception). They don't sound like B-sides to me. The quality of them as well is, to my ears, unquestionably higher than 90% of what's on Be Here Now.
Pure Reason Revolution - The Dark Third
Cymbals Eat Guitars - Pretty Years
Oasis - The Masterplan (should have released this instead of Be Here Now, it's a much better album)