First of all, as LS said, there are big clay and small clay.
Secondly, generally speaking, the ねんどろぃど series clay is what you call big clay.
This series of clay has different neck structures since Miku 200.
Use old connectors before 200, and use new connectors after 200.
Therefore, the mud surface before and after 200 is not universal, but other accessories can still be replaced.