Yes, the subject-specific Olympiads are totally different.
The events in science Olympiad are more specific science topics, and many involve some building/engineering aspect; most have some testing involving application of knowledge and problem-solving, even events that are primarily a written exam (some events are exam-style, some building engineering devices and some are lab or inquiry-based).

The individual Olympiads I am aware of are mainly knowledge-exams as far as I know, and not the same at all, not the same organization. If you google there is a lot of stuff online about science Olympiad, and about the others, too (at least there is for the physics one, the only one I have ever looked at).

Last edited by cricket3; 12/03/19 02:25 PM.