ImportMeshAsync how to replace the mesh with a new one?

Questions
1

Hello evry one!
When importing a mesh via ImportMeshAsync, if a mesh has been added, how do I replace the mesh with a new one?
PG - https://playground.babylonjs.com/#WGZLGJ#2406

2

Hurried up with the question)
To replace the mesh, I used the dispose function.
PG - https://playground.babylonjs.com/#WGZLGJ#2407