Nothing unique to the 744 here, so I'll give it a go.
Time alignment between mics and SBD recorded to the same 744 will vary from recording to recording, depending on your mic location, etc.
Regarding timing between two different 744s: if the 744s clocks are synced, there should be no drift between 744A and 744B, so you should only need to time align the start of each channel. If the 744 clocks were NOT synced, then you'll have drift between the tracks from 744A and 744B, and will have to either chop the tracks into smaller pieces and align regularly, or stretch the tracks from one 744 to match the tracks from the other 744.