Thanks for additional info, it is beginning to make sense now, for my machine at least, that there probably have been som replacement done in a previous life where som counters have not/could not be restored.
Anyway, for what it's worth, did some testing.
7803-01, counts +1 for every page printed, regardless of paper size, double sided counts +2 ofc.
7803-02, counts +1 for A4, both SEF and LEF, counts +2 for A3, double sided counts +2/+4 for A4/A3, counts for both B/W and color.
7803-03/04/05, same as 7803-02 except don't count on B/W ofc.
7803-14, counts same as 7803-02
Not much of surprice here I guess.
For me, I learned something new at least
Edit:
I have not tested which counts do not increase when printing reports for example.
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