My Piper is fairly "dark" for a "yellow lab"....I would say there are shades of darker tan, not sure if I would think of her as having any red on her though....is "fox red" an actual term? i have never heard of that before, and I was curious as you were about the shades of yellow labs....my lab Baylee is almost white, so when we got Piper, it was a real change for us.
This is Denali's sister Samantha!! They look a lot alike. I noticed in your pictures of him that the one where Angel is watching the puppy eat....is Samantha! She wore the thin red ribbon around her neck....very cute!