Don't think you can with CF.

Here's a macro that bolds the last 2 digits if greater than the first 2 for each cell in your selection

Link on where to add code

Sub xxx()
Dim Cel As Range
For Each Cel In Selection
If Right(Cel, 2) > Left(Cel, 2) Then
With Cel.Characters(Start:=4, Length:=5).Font
       .FontStyle = "Bold"
End With
End If
Next Cel
End Sub
VBA Noob