Well, sort of. I had planned on mixing/matching more or less at random. I have my first batch going and it's a mixture of RYR and some that look similar in packaging to the "Happy Panda" yeast balls (they're different in that they have a stag on the packaging instead of a panda bear.)
My first ever batch of rice wine has been going a week. It started out in a two-gallon container full of rice. It's now down to about 2" of head space, so something must be working. OTOH, I'm anxious, so I'm tempted to grind up some of the little blue ones and toss them in on top of what's already there, just to see if that would help it work faster/better.
The small packaging with the red writing says they are a product of Vietnam, and I think some other folks here have found some similar yeast balls.