Is there ANY way to combine results? (Pls view attachment)

You could use hook_views_pre_render(), run execute an alternative display (recommend an attachment that is not actually attached to anything), then merge (and sort!) the $view->result setup. They would have to have exactly the same fields.

You could probably also do something really whacky by creating a view style, as well, that could run an attachment and attempt to sort in the rows. Doing it that way would probably not require anything about the two views being the same, so long as they're using row plugins, but you'll still have to somehow sort the result rows.

A third alternative might be to run two views that just returns node IDs, then set all those node IDs as an argument to a 3rd display.

What is different about the queries, I can imagine ways to do that with one query but it depends on how the queries are different.

You could do some preprocessing on the rows to check the data on the user and, if it isn't a pro, set all the other fields to NULL. You'd do that hook_views_pre_view() and you'd have to be careful about 'group multiple' things. You'd need to unset data on the handler for that.

hook_views_pre_render() as mentioned in #1 worked great for me, but be warned that it may have issues with pagers.

My code below for reference if anyone wants it.

<?php
/**
 * Implements hook_views_pre_render().
 */
function MYMODULE_views_pre_render(&$view) {
  if ($view->name == 'MYVIEWNAME' && $view->current_display == 'MYDISPLAYNAME') {
    $other_view = views_get_view('MYVIEWNAME', TRUE); // <--- not sure if TRUE (reset) is required
    $other_view->set_display('MYOTHERDISPLAYNAME'); // <--- important
    $other_view->execute();
    $view->result = array_merge($view->result, $other_view->result);
  }
}
?>

why cant you go for Views Merged Rows - D7?

https://www.drupal.org/project/views_merge_rows