So long and I have never noticed that difference, if you pay attention the lines even seem to be quite different, both varieties are magnificent, I just passed up the opportunity to have a regal angelfish with blue chest because I have some problems with the water chemistry in my QT tanks, plus the fish was at least 5", more likely to fail when trying to feed it, I just hope it landed in good hands, I'll get my chance when the time is right.Indo Pacific Regal with grey/blue chest while the Red Sea and Indian Ocean have yellow chest. I never able to see the different between the Red Sea vs Indian Ocean variety
The Bali Regal Angels are CB regal angel of the blue/grey chest variety.
also the yellow chest variety have more yellow, wider yellow bands on body give it a lighter look when comparing to the Blue Chest variety. Both are stunning in coloration IMO
My Blue chest here are mid bared but you can see the thicker yellow bands on the yellow chest Regal