i would shake up each vial, dump half of each one into a flask and make a starter, and then you like the results, dump what's left in one vial into the other so you can use the blend again.
hah! Alton Brown.....that guy did a special on homebrewing, it looks like what he did would work, but he had the terminology all wrong, and the batch he made looked slightly less generic than Budweiser American Ale
I agree...yes people do mix yeasts, but not to just dump them in willy nilly, that is a waste...some of the Aussie Brewers mix belgian and lager yeasts to get certain flavor characteristics from each yeasts..That's a big difference from just dumping pretty much two similar ale yeasts together...they're really not that different to get anything out of them...
You wanna actually learn something and not waste the expensive yeasts? Split the batches like Nurmey said, and ferment the beers with the two yeasts and then compare them...You'll actually learn something for your effort...