It's hard to show in a picture but they are less yellow. Pumpkins are pumpkin colored whereas sunkist are reddish orange like sunkist orange soda. Also there's a slight possibility that these are Caridina Propinqua "orange bees" vs sunkist neos. I've had two very well versed shrimpers give me opposite opinions. I'll know if her eggs hatch. Propinqua need brackish.
Yours do seem to have a slightly more reddish hue to them although it's hard to say how much of that is due to the lighting and substrate differences between our photos.
Also I've noticed that if I provide my pumpkins with certain foods (nls ultra red for example) their color will shift redder over time and remain that way for a time even once the diet has been changed although the effect doesn't carry over to the offspring.