I have no experience with other systems besides ChatGPT and DALL-E accessed via browser. However, I speculate that different training data might be used, possibly even from different cultural environments (IPs / countries), under the same system. (It could be tested with pictures from culture specific background. for example, you test a prompt with typical Asian background in a other non-asian country, and check if you find “template effects” in Asian countries, not existing in other countries.)
The best proof for me that there are different data sets used is the ugly birdshit moon. In the browser version of dalle it is ALWAYS the same ugly moon, no matter in what picture it is a moon generated. With the moon you can proof it the easiest way, that the weights data are not the same.
I’ve also noticed the white spots. There may have been a nightshade infection at some point, and it’s possible that the white spots are remnants of that.
But at the moment, this is just speculation. As the developers generally do not answer questions. This policy of non-communication is not very helpful, so we are just left speculating.