The same plant will throw up variations on a theme depending on many factors, including temperature. I find that vendors often use the registration pics if their own pics in real life look substandard. So, it is a bad sign if everyone is using the registration pic. That is a sign you probably should not get that daylily.
One example that always jumps out for me is 'Spacecoast White Fang'. Everyone uses the one exact same photo to sell it, or seeds from it. Looking it up here, this is the one photo absolutely everybody uses:
Thankfully, a nice person has posted theirs which is not too different but just does not sparkle like in the first photo:
This is why our database is so very important. It shows what many people actually get in real life over a broad geography and time. It is my first go-to when choosing any daylily.
Also, a more extreme example from my own garden since I had this composite sitting around. The exact same seedling. Sometimes it looks pink with white dots, and sometimes it looks yellow polychrome. You would never guess both looks were from the exact same scape just on different days, right?