I was actually wondering about this myself a few days ago because i was switching from a regent to an avenger and BA to DBB. If weapon type, quality and mark being the same, shouldnt it be possible to use the damage/dps numbers on the weapon for comparison instead of the adjusted damage/dps numbers that you normally see in space? those get adjusted for set bonuses like the Obelisk 2pc dont they?
I cant really use my setup for comparison cause i also went from XI rare AP weapons to Voth AP VR XII. I was mostly wanting to get the same info you were looking for.
afaik from what i've read BA and DBB share the same characteristics for things like dropoff range and firing cycle. The major differences being the stats you see on the weapon: arc, damage/dps and power use.