Asivad can you please answer this question..
If I were in your position,
I would have asked my employer to mention both the exp in one letter and I will upload same letter in both placeholders and will write an explanation letter with a nice sweet and short explanation as i have exp with 2 noc codes and but with same employer, so my employer combined bot the exp and job duties in one consolidated letter so please kindly consider it.
Thank you.