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If you want to display the attached image gallery, from another post, you can use:
where the custom id attribute is the post ID.
If you want limit the number of items in a gallery, there seems to be a plugin available on wordpress.org called Limit parameter for gallery shortcode (no affiliation). It uses the pre_get_posts filter to change the posts_per_page and offset attributes of the get_posts() or get_children() calls in the gallery shortcode callback.
Example:
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