Can confirm that SBS6866E onwards are Batch 3 Citaros. Boarded
SBS6866E and noticed some differences to the earlier Batch 1 and 2
buses.
Differences observed:
1. Identical patterned flooring
throughout the bus (on Batch 1 and 2 the raised flooring uses a
different pattern).
2. Interior floor engine covers now have a
thick border surrounding it.
3. Lower half of interior glass panels are no
longer frosted, but now full black.
Also no DDU is installed. Gearbox is still a Voith and engine
still sounds the same.
Shot onboard SBS6559S today:

