I need help with ECU Terminals

Hello, I will completely change the injector cables of my car. I need a terminal for this. With the help of someone from the forum, I found the terminal pin part numbers below. However, there are 4 different pin numbers here, 2 of the numbers are the same, only there is a letter at the end, what do these letters mean? I found the direct ecu socket on Skoda's own website, I got information by sending an e-mail, they said that there are only small pins, the big ones (000 979 133 or 000 979 133AE can be used) are not included in the package. However, as far as I understand, the pins in the socket photo I shared below are not the same type as the pin I found from outside (000 979 018E). The big ones (000 979 133, 000 979 133AE) seem to be the type. What do the letters next to the pins mean? (Can 000 979 018E and 000 979 018A both be used in the socket? will there be a difference? or incompatibility)

Edited 3 October, 20241 yr by bugra