MarioD is well regarded in the BIAB forum as an expert. He is correct, the audio coming out of BIAB is always 44.1/16 bit.
However, the original poster is only importing MIDI from BIAB. Be aware that, in BIAB, you can do things to the MIDI such as Play, Slide Tracks to alter the timing of individual MIDI instruments. If you had done that, it might be more challenging to sync them with audio in SONAR. I have never had a problem, though, and even if you did, you have the Timer adjustment for MIDI tracks, right under the patch selector for each MIDI track in SONAR.
There is also a timing adjustment within BIAB to sync a soundcard audio and MIDI track, but to my knowledge, it alters the offset timing of the audio only, so MIDI exported from BIAB would be unaffected.