You might consider cutting them to length first and then lining them up edge to edge and running them thru the table saw cutting both at the same timeBoy, learned a lot of things “not” to do again! This is a drawer organizer for a small camper. Not very exciting but it has kept me busy for a couple of weekends. My biggest question/problem was cutting matching grooves for the removeable dividers at the exact same location on both pieces of wood? How do you cross cut multiple grooves along a piece of stock? I was using my miter with a board clamped to it but that seemed inefficient and difficult. I’m sure there is a better way, any suggestions?
Also setting stops on your miter fence will do the same thing. (Maybe you tried that) Best way is to set the stop ,cut both pieces, then reset the stop for the next and cut both,and so on.
You could also use a router by setting up a frame jig on the workbench to hold the pieces then clamp a straight edge to guide your router across where the slots are to be cut, you would have to have the right diam. bit too.
Hope this helps.