This particular pair has a coloring snafu. As quoted by Mike:
Rainbow the beanie is a Chameleon. This beanie has a collar of fabric around his neck. He should be made with a rainbow colored fabric (pink, yellow, red, green, blue... mostly light colors) (Ty-died)
Iggy the beanie is an Iguana. Iggy looks almost identical to Rainbow. He has no collar, but green spikes down his back, and is made with a blue green fabric (Ty-die)
Originally people thought that these two beanies somehow got their tags switched in production. What actually happened was their fabrics were switched.