Question Is it possible to turn a meshRenderer to skinnermeshRenderer

For example, I got 2 fbx file.
The mesh information is same: a simple t-pose human.We call them meshA(rigged) and meshB(not eigged).
and I improt two files to unity, one should work with skinnermeshrenerer and I set it to humanoid type, the other work with meshrenderer.

But, can I export the bones. boneweights and bindpose data from meshA and copy them to a new skinnermesh with meshB as a sharedmesh?

In the unity api, there is a code example in api: bindpose to create a skinnermeshrenderer by code:
https://docs.unity3d.com/ScriptReference/Mesh-bindposes.html

and I change the code to export data from meshA and copy to meshB, some code here:
export the data is simle, just declare an array and stroe them:

Code (CSharp):

1.         Transform[] BoneData = activeGameObject.GetComponent<SkinnedMeshRenderer>().bones;
2.         Matrix4x4[] BindPoseData = activeGameObject.GetComponent<SkinnedMeshRenderer>().sharedMesh.bindposes;
3.         BoneWeight[] BoneWeightsData = activeGameObject.GetComponent<SkinnedMeshRenderer>().sharedMesh.boneWeights;

and copy:

Code (CSharp):

1. activeGameObject.AddComponent<Animation>();
2.         if (activeGameObject.GetComponent<SkinnedMeshRenderer>())
3.         {
4.  
5.         }
6.         else
7.         {
8.             activeGameObject.AddComponent<SkinnedMeshRenderer>(); // auto replace the MeshRenderer
9.         }
10.         SkinnedMeshRenderer rend = activeGameObject.GetComponent<SkinnedMeshRenderer>();
11.         Animation anim = activeGameObject.GetComponent<Animation>();
12.  
13.         // build the mesh
14.         Mesh mesh = new Mesh();
15.         mesh = rend.sharedMesh;
16.         // assign bone weights to mesh
17.         BoneWeight[] copyBoneWeights = _CustomData.boneData.boneWeights;
18.         int safeLength =0;
19.         mesh.boneWeights = new BoneWeight[mesh.vertices.Length];
20. mesh.boneWeights = copyBoneWeights;

In my testing, when I copy data to meshB, it seems work well and no error or warnings. But visuially the meshB disappear. I can not tell why.
So, is it possible do this with the method mentioned above?