Can a 22" radius and an 18" radius E-Z track layout be connected by two single crossovers (44137 and 44138) and this entire layout with two trains be driven by one DCC 16V Digital Command?

What if I put a turnout in the 18" radius track as well?

What are the differences in the turn out curves for HO DCC sets - 44130, 44132, and 44135? Does the #5 or #6 require a different radius track?