I would say, yes -- one rehearsal so they can get comfortable with you. You know your musical acuity, but they don't. Also, if they are on the ball, they should have recordings of themselves available so you can learn any nuances without rehearsal.
This was my thought. One run-through to make sure you're on the same page with them. If that's too much of a burden (too far away, you're too busy, the gig doesn't pay enough) - you don't HAVE to take the gig.