Move duplicates rows above - excel

Question

I have sheet1 and sheet10 to run a macro to find duplicates comparing column A and B.
Highlight color duplicates, in column A, move duplicates to first row A1.
Any help will appreciate, thank you in advance.
Macro need to run in sheet 1 and sheet 10 maybe less sheets.
Sub sbFindDuplicatesInColumn()
Dim lastRow As Long
Dim matchFoundIndex As Long
Dim iCntr As Long
lastRow = Range("A1:C").End(xlUp).Row
For iCntr = 1 To lastRow
If Cells(iCntr, 1) <> "" Then
matchFoundIndex = WorksheetFunction.Match(Cells(iCntr, 1), Range("A1:A" & lastRow), 0)
If iCntr <> matchFoundIndex Then
Cells(iCntr, 2) = "Duplicate"
End If
End If
Next
End Sub

Answer 1

Build a range of the duplicate cells using Union, copy and insert them in the first row and then delete them.
Sub sbFindDuplicatesInColumn2()
Const DUP_COLOR = &H9696FF ' pink
Dim ws, rngDup As Range, c As Range
Dim arC, v, sht, lastRow As Long, n As Long
For Each sht In Array("Sheet1", "Sheet10")
Set ws = Sheets(sht)
n = 0
With ws
.Cells.ClearFormats
lastRow = .Cells(.Rows.Count, "C").End(xlUp).Row
arC = .Range("C1:C" & lastRow) ' array
lastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
For Each c In .Range("A1:A" & lastRow)
v = Application.Match(c.Value2, arC, 0)
If Not IsError(v) Then
.Cells(v, "C").Interior.Color = DUP_COLOR
If n = 0 Then
Set rngDup = c
Else
Set rngDup = Application.Union(rngDup, c)
End If
n = n + 1
End If
Next
' move cells and sort
If n > 0 Then
' copy to top
.Range("A1").Resize(n).Insert shift:=xlDown
rngDup.Copy .Range("A1")
.Range("A1:A" & n).Interior.Color = DUP_COLOR
' delete
rngDup.Delete shift:=xlUp
' sort
With .Sort
.SetRange ws.Range("A1:A" & n)
.Header = xlNo
.MatchCase = False
.Orientation = xlTopToBottom
.SortMethod = xlPinYin
.Apply
End With
End If
End With
MsgBox n & " Duplicates found in " & ws.Name, vbInformation
Next
End Sub

Answer 2

You should add comparing the values of ranges
Sub sbFindDuplicatesInColumn()
Dim lastRow As Long
Dim matchFoundIndex As Long
Dim iCntr As Long
lastRow = Range("A1:C").End(xlUp).Row
For iCntr = 1 To lastRow
If Cells(iCntr, 1) <> "" Then
matchFoundIndex = WorksheetFunction.Match(Cells(iCntr, 1), Range("A1:A" & lastRow), 0)
If iCntr <> matchFoundIndex AND Cells(iCntr,1).Value <> Range("A1:A" & lastRow).Value
Then
Cells(iCntr, 2) = "Duplicate"
End If
End If
Next
End Sub