To my knowledge all Apaches fitted with M-TADS (aka Arrowhead) have TEDAC (TADS Electronic Display and Control). TEDAC has also been fitted to all Block II and newer AH-64D Apaches.
New M-TADS/PNVS (Arrowhead)
Gunners cockpit: WAH-64D with MTADS and TEDAC
Gunners cockpit: AH-64D with TADS and ORT (Optical Relay Tube)
(This is what you currently have in the BIS Apache)
Lockheed TEDAC brochure:
Lockheed Arrowhead brochure:
Lockheed M-DSA brochure:
I can't find much on M-DSA besides for what components are included in the upgrade. It looks to me like the external appearance of the whole sensor housing won't change.