custom post types - Change picture attachment meta of all occurrences of a picture

I have a custom post type with multiple body copy boxes. I want to achieve the following.

1. Add an image attachment to one body copy box.
2. Add the same image to another body copy box by selecting it from the media library.
3. Change the image meta in one body copy box.
4. The image meta of the image in all other body copy boxes adopt the change I made in 3.

How can I achieve this? Can I do it with / ?