How to tell the diff. between 20v and 10v 200Q?

[Barton Oleksy]

I don't really ENJOY coming across as a complete newbie, but it seems I
can't help it...

I haven't come across this info, and one official-looking specs web page

didn't mention the 10-valve 200Q for my year, 1991.

I'm just assuming mine's the 10-valve, but what's the quickest way to
tell by looking somewhere?  (Manual's on the way from Audi USA...)

Thanks to all for their previous messages about the blower motor
replacement!

Bart