Direct injection injector codes

[Leoncupra2800]

Hi, I have a mk3 2014 Leon Cupra 280. I need to replace the di injectors. All the part codes for these injectors seem to be different. The number for the part code seem to be the same but they all have different letters in them.

My question is what do the different letters in the code mean? Are they just different revisions and can I still use them? The ones I’m looking at are genuine ones from aks tuning (06K906036N)

 

[andylong]

On the diesel injectors I replaced, whilst the part number is the same, a code is included, which essentially provides a value for the ecu to know the flow rate or similar of the injector.

 

[redone]

Can be revision but also different brand.