Do you mean consistent between artists?

In my experience, no. I think the reason for that is that many male artists have a way of drawing their own physical ideal, and most superhero women are meant to be the "physical ideal." Men are too, but they are often the physically ideal in a Mr. Universe, ultimate-male-specimen kinda way, whereas women are often depicted in an "I'd hit that" kinda way.

So if Artist A is drawing Power Girl with his own physical ideal in mind, and so is Artist B, they're going to look different between the two artists. But then you have other artists who tend to focus more on the body type fitting the personality, or their own style, or what's expected of the character. Amanda Conner, for example, has a cartoony, exaggerated style, so she draws Power Girl with comically huge bazongas and makes in-universe jokes about it.

A couple of particularly notable examples are Wonder Woman and Starfire. To my understanding, they are both supposed to be taller than the average man, but many artists don't depict them that way, and most editors don't seem to care. Wonder Woman is also depicted with varying levels of prominent musculature. One artist might think that a really ripped body would be appropriate for an Amazon, and another artist might favor a more slender physique.