How to make a metabox that will have all labels of the "Labels" metabox?

Question

WordPress

The task is to create, as it were, a clone of the "Labels" metabox, only to be able to select other labels there. Its task will be to display similar posts for the selected tags.
Why is it necessary? In "Tags" I have 20 tags selected, and I want to show similar tags only for 2 tags. If there are other options. offer)
Here is the result I would like:

Answer 1

1. Find the label metabox output code in WP core.
2. Copy to yourself.
3. Modify the code for your needs.