When you’re using wp_register/enqueue_script(), you’re basically pushing an element to an array named global $wp_scripts. Therefore you can’t echo something twice as WordPress successfully prevents scripts being registered or added multiple times.
The reason is easy: Else, every plugin that registers or enqueues jQuery (or uses it as dependency) would add another instance. Which would be an undesirable result.
If you need to echo something twice, simply handle that inside your script file.
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