Two heath aster species?

HELP! Between trying to ID moth species and keep track of butterfly varieties, I'm feeling a bit overwhelmed trying to figure out if we have one species of white heath aster or two. The photo above and the next four are of an aster I discovered growing close to the street in a bunch of grass. Could it be Symphyotichum ericoides?

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And then there's this heath aster (next three photos) that grows in our Meadow and that I've observed in years past. To me, these two asters look different and grow differently. Wildflowers of the Texas Hill Country isn't much help.....