well, there is that whole NEJ thing which is only accessible from the opening level of CI, which you sorta have to miss if you've got Dungeon-Be-Gone installed...
for what it's worth, DBG is listed as 'P' for 'probably compatible' on the
BP compatibility list. however, that probably needs to be unpacked somewhat...
With DBG isBig Picture probably compatible - as Nightmare says, the only game-critical additon is Kachiko, and she's available at the exit
BP-NEJ probably compatible, if you do the NEJ parts first then wander back and find Japser.
BP-BGT/ highly unlikely to be compatible - the transition between BG1 and BG2 is flaky enough as it is without adding DBG.
BP-BGT-NEJ/
any other BP-BGT-variant
[edited as per nightmare's advice]