Not very sure. But I refer all batches with for eg. VO3x Batch
3... Not very sure, once again.
Next one:
Mark III vs MK IV (DM)
MK III: Square side desto, top part of the back portion is flat,
purple A/C unit, driver's window is squarish, headlights are round.
Most seats are pinkish. 6 pairs of seats on the left side of the
bus after the back door.
MK IV: Rectangular side desto, top part of back portion is a bit
rounded, grey A/C unit, ads put up differently from MK III,
driver's window is trapezium, headlights are squarish. Most seats
are blue. 5 pairs of seats on the left side of the bus after the
back door. (But very spacious at the 1st seat.)