Merge text file with condition

I have two text files (report1.txt and report2.txt) that I want to merge with conditions:
- Matching rows that have same "ID" and same "TranVal", will keep only one instance
- Mismatching rows that have same "ID" both rows from 2 file, but column "TranVal" has different value, then the row from report2.txt will replace row in report1.txt
- Any "ID" that exists in one textfile but not the other one, will be copied to the final merged file
report1.txt:
TranDate,ID,TranVal,Comment
061211,9840,40,done
061211,9841,30,done
061211,9842,28,done
report2.txt:
TranDate,ID,TranVal,Comment
061211,9840,40,done
061211,9841,89,done
061211,9843,25,done
Final result should be:
merge.txt:
TranDate,ID,TranVal,Comment
061211,9840,40,done
061211,9841,89,done
061211,9842,28,done
061211,9843,25,done

Hi,
I just checked Import-Csv option. I will be able to manage this problem if i can get it in CSV format and work with objects, BUT the problem is in my real file
the file-format is different which is not comma-separated, instead have "-" as seperator. To simplify the problem i used comma in my question.
TranDate,ID,TranVal,Comment
061211-9840-40-done
Could
you suggest me if there is any way to convert "-" separators to CSV?

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