So who is MJ buying M-54 from? I use a lot of M-54 cuz it's the only dry Cal. Common yeast I've found, and liquid yeast just isn't feasible here.
I did split a batch of Dunkel a couple years ago between M-76 & 34/70, there was a noticeable difference between the two beers but the AA was within a couple percentage points, ABV was very close. The degree of difference could easily be a matter of age of the yeast, or my process. I've also split a Schwarzbier between M-76 and S-23, the flavor differences in those beers was very noticeable even though the end numbers were identical. Go figure.
Splitting a batch between M-44 and US-05 is already on my short list, might have to try it soon.
What would be the original yeast the MJ sells as M-42 New World Strong Ale? Anyone?