Stack them. Find the first shot-change within the film proper, record the frame-numbers (pertaining to the stacked video) at which this occurs in both transfers, and subtract one from the other to calculate the delay. That's one way.
Bear in mind that more than an initial delay might be required and that best is subjective. In future, use the @+username function when addressing questions specifically to me: I rarely read through threads these days and clicked on this one only because I remembered posting in it.