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I came to this solution. I could be simplified i guess and I would be happy if someone posted a shortened version.

Input file1:
ID,version,cost
1000,1,30,a
2000,2,40,b
3000,3,50,c
4000,4,60,d...

Need to compare 2 csv files.
Found similar problem solved here in forum but needs explanation and modification:

Im not allowed to post urls so here is the code from post.

awk -F\| '{
...