Compare old and new folder trees, delete if old\fldr1\a.a = new\fldr1\a.a

Since this seems like it might be widely used, didn't know if someone had this routine or a EXE already?

Basically I need to compare two folder trees, and if old\fldr1\a.a has the same contents as new\fldr1\a.a, then delete old\fldr1\a.a

TIA