While the styles have similar characteristics, these are not really Vienna Lagers.
I mentioned that I had cans of Upslope's Mexican Dark Lager in my fridge that I also should have compared (see U is for Upslope Brewing Company).
I typed "Maybe I'll do that side-by-side sometime soon."
Last Sunday, I did my side-by-side.
Upslope's Mexican Dark Lager still isn't a Vienna Lager. Honestly, it is closer to Modelo Negra than either of the other beers. But still, it was fun to compare.