After searching online, I see now that it is actually the Reveal SC 400 Rev.4 that has an FCC ID of I38-MMSN830.
To answer your first question. No, I38-MMSN811 is just a rebranded Sound Galaxy Nova 16 Extra, utilising the older AZT-1605 chipset (I've attached a picture of the sound card for you to confirm).
Aztech_2nd Generation_199x_Sound Galaxy Nova 16 Extra_I38-MMSN811_V1-1Y_1.jpg
Unfortunately, despite claiming to be Sound Blaster Pro compatible, it isn't really (at least, the digital sound playback). It does have an OPL3 FM synthesis chip, so you will get stereo sound music playback with games that supports it, but digital sound playback will only be mono (i.e., it would then behave just like your Sound Blaster 2.0 mono sound card).
I would rather look out for one that has an AZT-2316 chipset.
The drivers for this one is available on Vogons Drivers (together with a couple of other Sound Galaxy models).
Alternatively, you can go to Aztech's FTP site (ftp://ftp.aztech.com/support/DOWNLOAD/sg/) and download it from there - refer to the "index.txt" file to identify which folder has the correct drivers for your sound card.