Display post from current category and same tag?

Tags are a taxonomy called post_tag. You can use them in get_posts() via the tax_query.

Since wp_get_post_tags() returns an array of objects, you need to clean it up a bit since only one field per object is required for the query.

$tag_objects = wp_get_post_tags($post->ID);
$tags = array();
foreach ($tag_objects as $tag_object) {
    $tags[] = $tag_object->term_id;
}
$myposts = get_posts(array(
    'numberposts' => -1,
    'offset' => 0,
    'category__in' => array($category),
    'tax_query' => array(
        array(
            'taxonomy' => 'post_tag',
            'field'    => 'term_id',
            'terms'    => $tags,
        ),
    ),
    'post_status'=>'publish',
    'order'=>'ASC'
));