Displaying content from one WP site on separate WP site

I have two totally separate WP websites setup. Different domains, different databases. I manage both of them and they are both hosted on a dedicated server. I am trying to include some basic content that requires just a tad more than an RSS feed. I need to pull data from SITE-1 and display it on SITE-2, using basic WP formatting from a loop. Everywhere I’ve looked makes it seem impossible. I’ve tried calling wp-load.php but can’t get it to work, and am not sure if it is even the right way to go. I have access to both sites’ root servers, and even the server root if necessary. Is there anyway to do this? Thanks!

Add special meta box to custom post type

I have managed to add a meta box to my custom post type (see code below)
Now I need to add another meta box. With this box I want to display / edit a value from another table called wp_project_bids_mitglied. This table contains a row with the post ids and a row with the values (0,1,2) that I would like to edit / display in my backend. How do I have to change the code to achieve this goal? Thanks!

Turn Off Auto Update for Single Plugin

I have a plugin that I know I never want to update. I am aware that this is NOT best practice, but in this case it must be done. Is there any way to stop WordPress from prompting me to auto-update a particular plugin (but still alert as normal for all other plugins).