Looking at the two images in the AHS database.....
Scratch My Back, 24" tall, 5" bloom, very fragrant
http://www.daylilies.org/Dayli...
Dressed in Purple, 28" tall, 6" bloom
http://www.daylilies.org/Dayli...
The registration info is different enough that it might be a clue to figuring it out. Looking at the images in the AHS Database I think you might have them labeled backwards in the post above. Dressed in Purple appears to have wider tepals and a larger throat area like your first image. Your second image also gives a hint at a watermark as in the description of Scratch My Back. That would be my guess
Larry, images from the AHS database are not imported to the NGA database. The images are copyrighted with permission given to AHS for use.