Detect meta value changes when post is updated (post_updated)

Like @SamuelElh comment this is how I solved it:

add_action('updated_post_meta', 'check_meta_change', 0, 4);
function check_meta_change($meta_id, $post_id, $meta_key, $meta_value) {
    if( '<ENTER YOUR META KEY>' == $meta_key ) {
        // do stuff
    }
}

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