The 693A chipset for the J994AN-L is an error on J-Mark's site. They actually meant 694X. In fact, if you click on the link, you'll see VIA 694X.
So, it's clear then that you've got a board of the J994 family, right?
True, S=sound while N=No sound. Both the S and N use the same BIOS, while the S-L and N-L use the same.
Finding out the meaning of the "L".... seems like it stands for "PC Health Monitoring", after comparing the 993AS and 993AS-L. If your BIOS includes monitorization for this, then you've got the "L".
All the files are here, though:
ftp://210.201.178.73/