I'd like to know if there is something I can do to close the gap or hide the gap in the blinds. Obviously, I can measure properly and purchase new ones but really trying to avoid that.
I've also thought about curtains, but it's also something I'd like to avoid. Are there any solutions to this?
Here is another photo zoomed out. 
Purchase one, not two sets.
The two will always need a tiny little space between them in order to move independently.
Or place a vertical beam behind the gap :)