Your light buff ones look like my Buff Minorcas. I was hoping mine were Buff Orps, but they are just too slim and streamlined, upright,whiteish pink legs, etc...Yours look like mine, but I'm not sure how old yours are. Not sure about the others...I have Sumatras, Black Australorps, Black Stars, and White faced Black Spanish. They are all a bit different than each other. The Sumatras are totally black and smaller, the WFBS have whiter areas on their faces than the rest at a young age already ,the BS have a rusty patch of feathers on their chests, and the BA's are bigger and totally black. So I can't tell what yours are from the pix. Sorry.
Lisa