The difference between special operation certificate, senior electrician certificate and engineer

There is no causal relationship between the special operation certificate and the senior electrician certificate in your question and the engineer.

Special operation certificate

Special operation certificate is a qualification certificate that you must have a special operation certificate to prove that you can operate safely after training.

Senior electrician certificate

The technical grade evaluation of senior electrician certificate technician proves that the issuing unit is the Ministry of Labor and Social Security.

Engineers titles

The title of engineer is the grade title of professional technical level and ability of professional and technical personnel. The evaluation of engineers generally requires a diploma+professional and technical work+foreign language conditions. The issuing unit is the Ministry of Labor and Social Security.