Die Oberklasse

Hello!
As I can see in the datasheets, SL412 - is lighter version of SL410.

In SL412 chassis there are no next hardware functions:

• Auto-Dimming Raum (OPC)
• Home Control Interface (RS232)
• IR-Link

In SL412 chassis there are no next software functions, but they can be activated by USB feature stick:

• Multi Recording
• Mobile Recording
• Multiroom Streaming
• Bluetooth

My questions:
1. Am I right, or there are something more?
2. Are graphic processors the same on SL412 and SL410 chassis?
3. Do time shift and DR+ recording work on SL412 without USB feature stick (with external USB HDD)?