Comparison Report AMil-1900-D8e-AC and AMil-1900-D12e-AC 
- LCD: Same LCD, video driving circuitry and backlight the same? Yes
 - Keyboard/Trackball Module: Same item?  Yes
 - Control interfaces and displays (buttons, indicators) are the same? Yes
 - Power supply: Same module or design?  Different models --- previous is ENG ELECTRIC brand (48 Watts), now is DELTA ELECTRONICS brand (36 Watts)
 - DVI/USB inputs: Basically, the same electronics implementations just 4 more instantiations of that block put down.    
 
Different Functions Comparison
AMil-1900-D8e-AC  | AMil-1900-D12e-AC     | 
8 port DVI-I (support both VGA & DVI signal)  | 12 port DVI-D (support only DVI signal)  | 
With USB Hub x 3  | Without USB Hub  | 
Without external USB for external KB/MS  | With 1 x USB in the front (for external KB/MS) 
 
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      6. Internal Cabling: don’t know if the IO is straight to a card or is cabled, if cabled, cables are the same between 8 and 12? Both models IO are straight to a card/PCB      7. Video/USB Switch electronics essentially the same except 4 more inputs are fed in?  Different Video/USB switching board. please see attached image.