MN, A few years ago, before the big crash of '18 , someone from this site explained to me that the way - that person - decided between juvenile Black-crowned Night-Herons and juvenile Yellow-crowned Night-Herons, was to look at the white lines at the leading edges of the Primaries. Both of yours have those white lines, where - that person- implied that juvenile Black-crowned Night-Herons, pretty much do not. I checked my "guide" book to see what it said, though it was not clear about this. See what other, more experienced people say abut these white lines being - more distinguishing, than I suspect. Too, another juvenile bird with these white lines at the leading edges of it's Primaries is a juvenile Green Heron.