If you need to duplicate the same action in multiple projects, you don't have to sweat over it anymore. All you need to do is to click More to access the action menu and add your action to other projects via the Add action to project button. Once you've done it, you should be able to see the same card under those projects you've added it to!
Please note that those actions won't be related to each other in any way. If you want to have a single card displayed in different projects, you should consider using the Link to projects feature!