PLC ABB 07KT94 GJR5252100R3261 KBA

Hi, I am carrying out a project regarding the PLCs of the ABB brand mounted on KBA Rapida 105. Exactly I am analyzing the various models for 07KT94. I am faced with various suffixes after this name such as: B, C, F, I ...
Can anyone tell me what's the difference between all these letters?
Premise that the order code is always the same (GJR5252100R3261). Unfortunately I also found that trying to load the program on different letters, I get an error (Fehlerklasse: 2 Fehler-nr .: 00260). Thanks in advance for your help.

 

this may help.
https://www.koenig-bauer.com/en/ser...ogy-service-select/remote-maintenance/#c48039
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