Got a Sklylark 600 watt dimmer at Home Depot which is model number S-600PR-WH. Lowe's has a Skylark 600 watt model # S-600PH-WH. Neither of these numbers are shown on the Lutron website. The Lowe's one is $11.83 and the Home Depot one is $16.97. But with Lowe's it has to be sent to store and I want it this week. For price match purposes it has to be the same model. What is the difference between these, if any?