The trim codes help with emission control, and also balance out microscopic differences between the injectors to make them all function in exactly the same manor.
This is based on the theory that no 2 are identical.
The codes make tiny adjustments to compensate for the small tolerances when they are manufactured.
I have worked on cat equipment for 19 years, and was there right through the HEUI phase.
I have been sent out to machines that would not except trim codes, and the ECM has calculated it's own value.
I would bet a fair amount of money that you will not be able to tell the difference between having the codes and not.
In the ideal world and in a developed country, I would trim the injectors.
In the mining world, I am really not that bothered about it.