There is true shepardi and "fake" shepardi which is a hybrid of rusty and flame..
The real shepardi is only found in Guam and there is very limited/no collection there.. Only recently there is a collection which collected some shepardi which is sold in US market..
Those "shepardi" that we get are from philippines region which are hybrid of rusty and flame, and yes flame is found in philippines...
But the difference is very minute and it really varies with the hybrid, you could get one hybrid that looks a lot like the real shepardi.. Whether it is shepardi or not as long as you like the fish, I think it wun make a difference, unless you die die want a real shepardi..