I think morphs in general would tend to grow faster. I have no hard evidence, just a thought experiment.

They come in from the wild as eggs / hatchlings and are sold at some point to one of the big name breeders who usuallly line breed them. Since the ones that grow the fastest start making babies faster those babies may carry these better growing genes. I have no idea if there's any truth to it but it's worth a thought I think, and support the general notion that "morphs tend to grow faster".

But honestly, when's the last time any scale breeder looked at the growth rate of a normal male haha.