I thought I was on the right track, but have messed it up somewhere.
Sorting based on a match in column C was easy enough, and then I could go down and visually pick out where I had a mismatch in column D. Tried to get a formula in E that would just return a YES in the highlighted rows.
=IF(COUNTIF($C:$C,C2)=1,"",IF(COUNTIFS($C:$C,C2,$D:$D,D2)=COUNTIF($C:$C,C2),"","Yes")) does NOT work, but I think it may only need some minor change to do so...
[TABLE="width: 579"]
<colgroup><col><col><col><col><col></colgroup><tbody>[TR]
[TD]Rep[/TD]
[TD]Customer[/TD]
[TD]Order Num[/TD]
[TD] Due Date[/TD]
[TD]No Match[/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0507075687[/TD]
[TD] 12/12/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0507075687[/TD]
[TD] 12/12/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508231008[/TD]
[TD] 12/7/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508231008[/TD]
[TD] 12/13/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508780590[/TD]
[TD] 12/13/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508780590[/TD]
[TD] 12/13/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509178265[/TD]
[TD] 12/16/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509178265[/TD]
[TD] 12/16/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509861570[/TD]
[TD] 12/23/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509861570[/TD]
[TD] 12/23/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0513386029[/TD]
[TD] 12/2/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0513386029[/TD]
[TD] 12/2/2018[/TD]
[TD] [/TD]
[/TR]
</tbody>[/TABLE]
Sorting based on a match in column C was easy enough, and then I could go down and visually pick out where I had a mismatch in column D. Tried to get a formula in E that would just return a YES in the highlighted rows.
=IF(COUNTIF($C:$C,C2)=1,"",IF(COUNTIFS($C:$C,C2,$D:$D,D2)=COUNTIF($C:$C,C2),"","Yes")) does NOT work, but I think it may only need some minor change to do so...
[TABLE="width: 579"]
<colgroup><col><col><col><col><col></colgroup><tbody>[TR]
[TD]Rep[/TD]
[TD]Customer[/TD]
[TD]Order Num[/TD]
[TD] Due Date[/TD]
[TD]No Match[/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0507075687[/TD]
[TD] 12/12/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0507075687[/TD]
[TD] 12/12/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508231008[/TD]
[TD] 12/7/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508231008[/TD]
[TD] 12/13/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508780590[/TD]
[TD] 12/13/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0508780590[/TD]
[TD] 12/13/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509178265[/TD]
[TD] 12/16/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509178265[/TD]
[TD] 12/16/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509861570[/TD]
[TD] 12/23/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0509861570[/TD]
[TD] 12/23/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0513386029[/TD]
[TD] 12/2/2018[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD] [/TD]
[TD] [/TD]
[TD]0513386029[/TD]
[TD] 12/2/2018[/TD]
[TD] [/TD]
[/TR]
</tbody>[/TABLE]