Yeah I agree that Circe is the one who has the most inconsistent character design. Her most noticeable feature was her purple hair but even in animation that gets switched around. That's the only Wonder Woman character I can think of who's design could confuse even comic book readers if you like to jump around comic runs, like I do.
Etta has changed ethnicity's, but she's been African American for 10 years now, so I could only see that confusing people who are just fans of the movie and have never read a recent Wonder Woman comic.
Cheetah has a lot of designs but her most iconic element, yellow cat-lady with spots, is consistent enough to be recognized anywhere. Weather she's a woman in a cat costume, a were-cheetah with long hair or just fur, she's recognizable. DC only has 2 cat ladies, Cheetah and Catwoman, both are iconic and look nothing alike so there's not real competition for who's who.
In fact, Catwoman has had even more changes than Cheetah throughout the years and remains recognizable, from hair color and length to ethnicity to costume. It could be because she hardly ever leaves Gotham City, so if you see a lady in a purple or black cat costume in a city, it's Catwoman.
Every other character has stayed very consistent throughout their history weather it's live action movies, animation, comics and video games.
Gigantia has stayed very consistent throughout the years, red-haired giant woman, wears yellow.
Ares, covered in blue armor, horned helmet.
Dr. Psycho, small man with buggy eyes.
Silver Swan, winged woman with sonic scream.
Dr. Poison, Green jumpsuit.