Exactly how it's done is beyond the scope of this answer, but here are some resources.
How To Match Existing Wall Texture. How to match wall texture. How to patch orange peal wall texture.
How to apply skip trowel texture to a stucco repair - YouTube from i.ytimg.com
The chances of matching an existing drywall finish, or texture, depend on identifying the technique. Would appreciate help on this. It is possible to texture over existing textured walls and ceilings as long as your existing texture has not been heavily applied.
In today's video i show you how to easily fix damaged drywall by skim coating and then how.
To smooth your textured walls with a skim coat, you will need: Give your plain, uninspired walls new life with these timeless wall texture types. Knowing how to texture walls is an inexpensive way to add a unique and interesting touch to your rooms. There is a slight texture to my walls.