Can I use a Sunrise Chart when comparing?

It is important to assign a birth time because we need to know the Ascendant for both people.  When you use Sunrise Charts when comparing, the app will assign Aries for both the person's Ascendant and MC because the Ascendant will be undefined.  The app will confuse "undefined" (0) for Aries (0 degrees) and also listed in the First House because, again, it's undefined.  Same for the MC.  The workaround is to either assign an actual time to the Sunrise Chart or else just ignore the Ascendant and MC entries in the comparison list.