While you're crunching numbers don't forget to add in the injured.
And compare the number of dead and injured in both engagements. In 'Nam, more of the seriously injured died. Better armour, weaponry, communications, evacuation, and medical care in this war means more of the injured survive - but with deep scars. And while you are at it, compare this number as a percentage basis of troops in the field. Right now your comparison is statistically misleading: spin with numbers. I look forward to seeing the results of a more in-depth analysis.