Hi Geedublya,
I don't actually have a 2014MY spec sheet, earliest I have is MY2015.5 . So I stand corrected. Certainly by MY2015.5 the Dynamic response , Torque vectoring and Dynamic program were standard on both SDV8 HSE and SDV8 HSE Dynamic. So in addition to the red brakes and increase in top speed you also got active vanes when you went from SDV8 HSE to SDV8 HSE Dynamic and possibly some extra bling. (actually, when I look up a VIN for a 2014MY SDV8 HSE (non- Dynamic) in Topix I do see things such as REAR AXLE ACT LCKG DIFF W/TVBB and TERRAIN RESPONSE 2 W/DYN PROG and ACTIVE ROLL CONTROL) I expect it was due to the heavier weight of the engine. Anyway, in order to get the e-diff on a RRS SDV6 you either had to get the On/Off Road pack at $8.1k back then, now over $9k, but only available on certain model years, or go up to SDV6 Dynamic or SDV8. On a D5 you only need to spend extra $3.2k for the Capability Plus pack. On a FFRR I don't think you can get an e-diff on the TDV6 here, you have to step up to the SDV8 (ouch) .