Also D-ABCA and D-ABCB using this type of exhaust nozzle. It's called "Chevron Nozzle". Mainly it's used for noice reduction.
It can also be ordered on other Airbus Types but the A321 ist very critical in terms of noice emission so AB decided to install it on the newest A321 only so far.
I knew that Finnair use this type of exhaust nozzle on some of there A319, A320.
Also Embraer has Chevron Nozzles installed on their 170, 175, 190, 195 modells.
Greetings
Michael