There is no OOTB CLT provided for this.If you can find a reasonable CLT version of diff or diff3 for your Windows box, you should be able to supply it the file system paths of the versions of the DCR you want to compare.Alternatively, you can do the comparison through the GUI using the Compare or Compare To... options (and make sure to select the Source tab, or buy a [fairly cheap] license for Beyond Compare and use that for doing source diffs.
Thank you Adam,I am searching alternative of iwrcsdiff command in windows environment.Depending on difference of both DCR, i want to perfrom some operation according to difference we get.so GUI compare and Beyond compare will not help here. If i get something on window, i will update here..