I thought they were the same too, until I came across an auction where the seller was boasting s/he was the originator of the Yellow Jackets. I just did some Googling, the only thing I managed to find was that the Yellow Jackets are supposedly just a brighter version of the Tiger, similar to Red Cherry/Sakura/Fire Red Shrimp, though I'm not sure if that's true and/or the official word on it. I wonder if the Chilis and Scarlets have something to do with color intensity as well.