[Closed] SDK: replace a node's existing mesh?

So this is a fairly simple one, I just want to make sure I have all the right steps to make the SDK do what I want.

I have 2 different already-existing nodes, say obj1 and obj2. For the sake of simplicity lets say they are both editable mesh objects. Now, for obj2, I want to replace the existing mesh with a copy of the mesh from obj1. What is the correct sequence of actions to make this happen?