Sir,
You are unaware that 3E is different from 3A.
3E coaches are Garib rath type of coaches.
These have 3 berths on the side rows (SL, SM and SU).
Not sure of Duronto 3E...
more... coaches where 4 types of coaches is there from the number of berths point of view - 75, 78, 81 and 84. And, the seating arrangement is 2 or 3 types there.
8 can not be SU that is sure. Whether that is SM and 7 is SL too is not sure.