Are the small four-wheel eccentric bearings all the same model?

It's different. Different small four-wheel eccentric bearings have different models. Bearing model consists of a series of numbers and letters, which are used to identify the size, structure and characteristics of bearings. The specific model of eccentric bearings used by small four-wheeled vehicles, different brands or models of vehicles will use eccentric bearings of different sizes or materials to meet their unique engineering needs, so they are different.