cranks

I current run 175mm dura ace cranks on my roadie and want to experiment with 170mm. Do all shimano cranks use same BB pattern.
I.e. can I put ultegra or 105 cranks on dura ace BB?

if its external bearing BB (aka hollowtech), yes

There the 2007/ 2008 dura ace cranks that every tom dick and harry rides.

then the answer is yes if you are swapping for any other new shimano crank as they are all hollowtech

[Dr Matt]

Do all shimano cranks use same BB pattern.

easy answer: yes.
longer answer: assuming you're staying within square taper, octalink or hollowtech-II, then yes.