Compile Error Ambiguous name detected worksheet_change

So im using this code to create time stamps

Code:

Private Sub Worksheet_Change(ByVal Target As Range)'Check is column J (10)
If Not Target.Column = 10 Then Exit Sub
'Check is single cell entry
If Not Target.Cells.Count = 1 Then Exit Sub
'otherwise datestamp K in same row
Target.Offset(0, 1) = Now
End Sub

However I want to repeat this with column N and O

I tried to create my own code in notepad, This is what i came up with

Code:

Private Sub Worksheet_Change(ByVal Target As Range)
'Check is column N (10)
If Not Target.Column = 10 Then Exit Sub
'Check is single cell entry
If Not Target.Cells.Count = 1 Then Exit Sub
'otherwise datestamp O in same row
Target.Offset(0, 1) = Now
End Sub

However its coming up with "Compile Error Ambiguous name detected worksheet_change"

what am i doing wrong ?

Ok so I ended up doing this.

Private Sub Worksheet_Change(ByVal Target As Range)
'Check is single cell entry
If Not Target.Cells.Count = 1 Then Exit Sub
'Check is column J (10) or N (14) or R (18) or V (22) or Z (26) or AB (30) or AD (34) or AH (38) or AL (42) and if yes then  datestamp cell to right
If Target.Column = 10 Or Target.Column = 14 Or Target.Column = 18 Or Target.Column = 22 Or Target.Column = 26 Or Target.Column = 30 Or Target.Column = 34 Or Target.Column = 38 Or Target.Column = 42 Then Target.Offset(0, 1) = Now
End Sub

Thank you everyone for your suggestions

How about possible extensions for further columns?
They are spaced quite regular in your sheet, so may be the following is worth considering:

Private Sub Worksheet_Change(ByVal Target As Range)
Dim tc As Long
If Not Target.Cells.Count = 1 Then Exit Sub
tc = Target.Column
If tc >= 10 And tc Mod 4 = 2 And tc <= 42 Then Target.Offset(0, 1) = Now
End Sub