Restrict Worksheet Change Event To Last 3 Worksheets

I am trying to make a macro run automatically based on info entered in a cell. The problem is I need this code on at least three separate sheets in the work book. It doesent work when I try to use the same basic code. The code I am using is below.

Option Explicit

Private Sub Worksheet_Change(ByVal Target As Range)
Dim lLastRow As Long
Dim rgArea As Range, rgCell As Range
Dim COL_B As Integer
COL_B = 2
Dim COL_X As Integer
COL_X = 24
Dim ROW_FIRST As Long
ROW_FIRST = 5

' Find the last row of date in the "Approved" worksheet
lLastRow = FindLastRow(SZ_WS_APPROVED, COL_B)

' Set a reference to the changed cells in column X
Set Target = Intersect(Target, Range(Cells(ROW_FIRST, COL_X), Cells(lLastRow, COL_X))).........................