Both owned by Salem Communications I believe. Years ago they were the WMCA Good Guys who ties themselves to Beatlemania. Allegedly the first NYC station to air a Beatles record (I wanna hold your hand on 12/26/63) though supposedly WINS aired She Loves you a few months earlier in a listener poll.
As it is NYC is getting another religious station as 1560 has been sold from Disney to Family Radio
My guess is that at the lower dial position 570 provides better signal propagation. So Salem will likely move Medved, Hugh Hewitt and company down the dial to 570 and park the preachers on 970.