Need code for two lists, seperate worksheets, both to update eachother automatically.

I have a named range list in sheet 1 and a copy of it in sheet 2. I'm looking for code so that if I change something in the list on sheet 1 it does it for sheet 2. And if I change something on sheet 2 it updates on sheet 1. Any help is much appreciated!!

Thanks

Thank you for your help although its not quite what I had in mind. Let me give you what I've got working for me so far:
This is code I have for Sheet1 that is working its way over to Sheet2.

Option Explicit

Private Sub Worksheet_Change(ByVal Target As Range)
    Dim Cell As Range
    Dim isect As Range
    Dim FORM_LIST As Range
    Dim MASTER_LIST As Range
    
    Set FORM_LIST = Worksheets("Sheet1").Range("FORM_LIST")
    Set MASTER_LIST = Worksheets("Sheet2").Range("MASTER_LIST")
    
    Set isect = Intersect(Target, FORM_LIST)
    If Not Intersect(Target, FORM_LIST) Is Nothing Then
        For Each Cell In isect
            MASTER_LIST.Value = FORM_LIST.Value
        Next
    End If
End Sub

Now when I tried to write the same code in Sheet2 I got errors.

So I hope I gave you a little better idea now of what I'm trying to do. I just want the two lists linked where I can make a change on either one.