You're right. But there's a photo here of an AB that can fit micron's nozzle and also explanations are given, so I'd say there's not much risk there. I've also bought spares which I expected would fit one of my AB, but they wouldn't. I understand what you're saying. But it seems like this thread is another case. Man tried to fit different parts and they work, he has shown his experiments with photos and good explanations of what was done.