Huntmaster
Free Ranging
From some of those pics in the brighter light they do look to be whiter than your first pics. And from what I can see from their lower wing barring it does seem to have wide white barring Merrium's also have wide whiter wing barring but so hard to really tell from pics and different lighting I couldn't tell you for sure without actually seeing them in person. The thing that doesn't look like most Merrium's is there doesn't seem to be much white on their lower back feathers leading to tail but like you stated they seem to be missing a lot of those feathers and tail tips but there isn't much there and might show up better after a molt they are a little ragged in those areas. On a good note, from what I can see I don't see anything that would say they definitely are not. Do they seem to have longer legs/taller leaner body's than your heritage varieties?