The drivers appear to be the same size. I don't see a spec difference that would affect the space requirement (significantly)
But 1) I have no clue, never compared them, only heard Olympicas a few times 2) my approach would be to maximize the value my money and buy the best speakers FOR THE SPACE which may be bookshelves.
This a lot of money for speakers, all in all it's good that you know what you want, otherwise you could spend months and years chasing the best speakers for your space.

