[reshz]

So, let's see..

The buses of KTEL Attikis aren't fully numbered. There's no answer why! 
ΧΕΗ-8344 up to ΧΕΗ-8350 are in KTEL Thivon from the first day.
XEH-8369 is Citaro LE ex Berlin and operating by KTEL Evoias.
The new buses of KTEL Attikis are Citaro LE Ü, right.. 

At the end at KTEL Korinthou and KTEL Attikis you can find urban and suburban buses with the same fleet number. That's based on the fact that the buses in Athens can't work nowhere else cause they're equipped with OASA's speciallyties.

Thank you for your reply!