I meant this:
From what I remember, one uses HISM (one object), so that shader shouldn’t work. Second should work. I originally thought that someone from Epic would help you with this (so i deleted previuous comment), so that the questions would not be repeated and the forum would not be so dead, crowded and unclear, but apparently not.
I found it in documentation. But in UE i practically never used it in terms of optimization, but it should still work. It shouldn’t have much impact on a small project, if you do not have thousands of trees.
Documentation
“Static Meshes placed with Foliage Edit Mode are automatically grouped together into batches that are rendered using hardware instancing, where many instances can be rendered with only a single draw call, while Actor Foliage comes at the same rendering cost as placing normal Actors into a scene.”