Pure rotational transitions of (CrN)-Cr-52-N-14 and (MoN)-Mo-98-N-14 radicals in their X (4)Sigma(-) state were recorded using a pump/probe microwave-optical double resonance (PPMODR) technique from which the hyperfine parameters of N-14 (I=1) were precisely determined. In addition, the (0,0) A (4)Pi-X (4)Sigma band system of (CrN)-Cr-53 was recorded from which the hyperfine parameters of Cr-53 (I=3/2) were determined. The newly determined hyperfine interactions for Cr-53 and N-14 in CrN and N-14 in MoN and the previously determined hyperfine interactions for other early transition metal mononitrides were analyzed using a simple, single configurational, model. The improved set of fine structure parameters for the CrN and MoN are discussed in terms of possible electronic state distributions.