So basically the sand I use for my easterns is safe for my western then?

Also as far as hognose dispersion I believe you fully, I'm just talking locally. Fire suppression in many areas has ruined habitat and messed up our soil type. I have seen higher concentrations in drift fences on sand hills for sure but that is the next county over. With more water easterns may be more spread as well. In the west with less water as you implied the westerns may also have higher concentration based on less habitat available with proper hydration. That MIGHT be a factor involved.