See if this works for you. If not maybe you can post the sheet.
Sub Nav()
Dim ws1 As Worksheet, ws2 As Worksheet
Dim i As Range, C As Range
Dim lr1 As Long, lr2 As Long
Set ws1 = Worksheets("Controller")
Set ws2 = Worksheets("Order Conversion")
lr1 = ws1.Cells(ws1.Rows.Count, "B").End(xlUp).Row
lr2 = ws2.Cells(ws2.Rows.Count, "A").End(xlUp).Row
For Each i In ws1.Range("B2:B" & lr1)
For Each C In ws2.Range("A2:A" & lr2)
If i.Value = C.Value Then
C.Interior.ColorIndex = xlNone
End If
Next i
Next C
End Sub
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