But my limitation is to use DFSORT only we dont have authority to use ICETOOL.
ICETOOL has been a fully documented, fully supported part of DFSORT since 1991!
ICETOOL has functions that can be used to compare records that DFSORT itself does not have. So if you can't use ICETOOL, you're probably out of luck. I'd suggest you either try to convince the idiots at your shop to allow you to use ICETOOL, or try to find a compare utility that will do what you want (if you're allowed to use any compare utilities).