zombie_mp/Assets/Scripts/Helpers/MeshCombine.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using EasyButtons;
public class MeshCombine : MonoBehaviour
{
    public SkinnedMeshRenderer target;
    public Transform sourceRootBone;
    public Transform[] bones;
    [Button]
    void Recalculate(){
        target.rootBone = sourceRootBone;
        //target.bones = src.bones;
        Transform[] bonesT = new Transform[target.bones.Length];
        for(int i = 0; i < target.bones.Length; i++){
            Transform targetBone = target.bones[i];
            string targetBoneName = targetBone.name;
            foreach(Transform sourceBone in sourceRootBone.GetComponentsInChildren<Transform>()){
                if(targetBoneName == sourceBone.name){
                    Debug.Log("Switching bone : " + targetBoneName );
                    bonesT[i] = sourceBone;
                    break;
                }
            }
        }
        target.bones= bonesT;
        bones= target.bones;
        target.sharedMesh.RecalculateNormals();
        target.sharedMesh.RecalculateBounds();
    }

    [Button]
    void GetSelfRenderer(){
        target = GetComponent<SkinnedMeshRenderer>();
    }
}