I found out a solution that seem working it's this, if anyone needed or may give some help. Thanks anyways
rivate Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
For i = 0 To ComboBox1.Items.Count
If ComboBox1.SelectedIndex = (i) Then
ComboBox2.SelectedIndex = (i)
End If
Next
End Sub