Here's a good article on the differences between Siamese and Chinese Algae Eaters with identifying drawings
Algae Eating Cyprinids
They are very different fish. IME Chinese AE are better kept solitary, and can be grumpy as they age. SAE are best in groups, and although may bicker amongst themselves leave the other fish alone. I have 3 which school with a similar barb sp, but only give the occasional nip to each other.
Again, this is just my experience, I've heard about adult SAE picking on other fish, but in those cases they've been kept as a single and haven't had a school to spread out any aggression.