Array index is out of range

I have one question, I have the script to edit all children in the object, from second object. Both objects have the same number of children, of course, the same material ... but after running I got error "Array index is out of range." It's strange, because if I set the same object for regular and smoothed, here's no error as well if objects have only one child ... I tried foreach instead of for, but it did not help ... Any ideas?

     public GameObject regularMesh;
     public GameObject smoothedMesh;
 
     private float ScaleAndBias(float normal)
     {
         return (normal * 0.5f + 0.5f);
     }
 
     void  Start (){
         MeshFilter[] allChildren = new MeshFilter[regularMesh.transform.childCount];
         allChildren = regularMesh.GetComponentsInChildren<MeshFilter>();
         MeshFilter[] allChildren2 = new MeshFilter[regularMesh.transform.childCount];
         allChildren2 = smoothedMesh.GetComponentsInChildren<MeshFilter>();
 
         for (int m = 0; m < allChildren.Length; m++){
 
             Mesh m1 = allChildren[m].mesh;
             Mesh m2 = allChildren2[m].mesh;
 
             GameObject go = new GameObject(allChildren[m].transform.name);
             go.transform.parent = this.transform;
 
             MeshFilter meshFilter;
             meshFilter = go.AddComponent<MeshFilter>();
 
             MeshRenderer meshRenderer;
             meshRenderer = go.AddComponent<MeshRenderer>();
             meshRenderer.materials = allChildren[m].renderer.materials;
             Mesh newMesh = new Mesh();
             meshFilter.mesh = newMesh;
 
         Color[] newColors = new Color[m1.vertexCount];
 
         for (int i = 0; i < m1.vertexCount; i++)
         {
             newColors[i] = new Color(ScaleAndBias(m2.normals[i].x), ScaleAndBias(m2.normals[i].y), ScaleAndBias(m2.normals[i].z)); 
         }
 
         newMesh.vertices = m1.vertices;
         newMesh.triangles = m1.triangles;
         newMesh.normals = m1.normals;
         newMesh.uv = m1.uv;
         newMesh.colors = newColors;
 
         }
 
         //ObjExporter.MeshToFile (meshFilter, Application.dataPath + "//Test.obj", true);
     }