I have 2 sheets, Sheet1 : Data in row 1 headers like ID,Name, Country,State,ZIP,Invoice Number
Sheet 2 : Data in Column2 like ID*,name,Country,State,zip,invoice Number

I want the alert result as : (it has to do exact match)

Misspelled Headers in Sheet2 :
Invoice Number

How is this achievable? Match function gives the alert popup for all matched case too. i have taken as 2 ranges (sheet1 and sheet 2)
Dim SourceSheet_header As Worksheet    'The data to be copied is here
Dim TargetSheet_header As Worksheet    'The data will be copied here
Dim ColHeaders_header As Range         'Column headers on Target sheet
Dim MyDataHeaders_header As Range      'Column headers on Source sheet
Dim DataBlock_header As Range          'A single column of data
Dim c_header As Range                  'a single cell
Dim Rng_header As Range                'The data will be copied here (="Place holder" for the first data cell)
Dim lastrownum_header As Integer
Dim lastcolnum_header As Integer
Dim get_last_cellheader_check  As String

'Dim check_type As String
'Change the names to match your sheetnames:
Set SourceSheet_header = Sheets("Sheet1_Data") 'sheet1
Set TargetSheet_header = Sheets("Sheet2_Details") 'sheet2

With TargetSheet_header
'   Set ColHeaders_header = .Range("B2:B46") ' .Range(.Cells(1, 1), .Cells(1, .Rows.Count).End(xlToLeft)) 'Or just .Range("A1:C1")

'    Set Rng_header = .Cells(.Rows.Count, 1).End(xlUp).Offset(1)
   lastrownum_header = Sheets("Sheet2_Details").Range("B" & Rows.Count).End(xlUp).Row

Set ColHeaders_header = .Range("B2:B" & lastrownum_header)

End With

With SourceSheet_header
'    Set MyDataHeaders_header = .Range("A1:AX1")
lastcolnum_header = Range("A1").End(xlToRight).Column
get_last_cellheader_check = ColumnLetter(lastcolnum_header)
 'MsgBox get_last_cellheader
Set MyDataHeaders_header = Range("A1:" & get_last_cellheader_check & "1")

   End With
   Dim colIndex As Long
'colIndex = Application.Match(colName, Range(Cells(RowIndex, 1), Cells(RowIndex, 100)), 0)
'Makes sure all the column names are the same:
'Each header in Source sheet must have a match on Target sheet (but not necessarily in the same order + there can be more columns in Target sheet)
    For Each c_header In MyDataHeaders_header
        If Application.WorksheetFunction.CountIf(ColHeaders_header, c_header.Value) = 0 Then
         MsgBox "Column : " & c_header.Value & " is missing in Sheet2_Details"
        End If
         If Application.WorksheetFunction.Match(MyDataHeaders_header.Value, ColHeaders_header, 0) Then
         MsgBox "Column : " & MyDataHeaders_header.Value & " misspelled in Sheet2_Details"
        End If
    Next c_header