conditional formatting should do that
Is
this the same row -
ie
column D3 has 20 in
column C3 has 20 in
then highlight row 3
or
ie
column D8 has "fred" in
column F8 has "fred" in
then highlight row 8
or does it matter where it is
ie
column D8 has "fred" in
column F212 has "fred" in
then highlight row 8
With conditional formatting
you can use a formula
=select the range - say A1 to Z2000
use a formula
=AND( $D1 <> "" , OR( $D1 = $C1, $D1 = $F1 ) )
will check each row
different if the value can be anywhere, would use a countif() formula - but let us know