If you are WDW regulars, there are some things you could skip. I post this list pretty regularly, but for your convenience:
DL Exclusive Attractions:
Indiana Jones and the Temple of the Forbidden Eye (uses same ride system as DINOSAUR at AK)
Snow White's Enchanted Wish
Pinocchio's Daring Journey
Mister Toad's Wild Ride
Casey Jr. Circus Train
Storybook Land Canal Boats
Alice in Wonderland
Sleeping Beauty Castle Walkthrough
Roger Rabbit's Car-Toon Spin
Chip & Dale's Gadget Coaster
Finding Nemo Submarine Voyage
The Matterhorn (note this uses the same ride system as Space Mountain at MK)
Space Mountain (same theme but completely different ride)
DL Similar but not exactly the same:
Enchanted Tiki Room - longer show
Jungle Cruise - No temple/tunnel, a bit shorter
Pirates of the Caribbean - longer with more show scenes
Haunted Mansion - even without the Nightmare overlay it is slightly different
The Many Adventures of Winnie the Pooh
Big Thunder Mountain - some additional effects and scenery
it's a small world - very similar though with Disney cahracter peppered in - it does have a much nicer exterior.
Autopia - much longer than the Tomorrowland Speedway, but basically the same
Buzz Lightyear Astro Blasters - removable laser blasters make it a little better
DL Exactly (or basically) the same:
Peter Pan's Flight - technically some minor differences
Dumbo
King Aruthur Carousel
Milennium Falcon: Smugglers Run - all of Galaxy's Edge is practically identical
Rise of the Resistance
Mad Tea Party
Mickey and Minnie's Runaway Railway - The queue is very different and cool - may be new to you and is worth it if so.
Star Tours
Astro Orbitor - though at ground level
CA Exclusive Attractions:
Monsters Inc. Mike & Sully to the Rescue
Guardians of the Galaxy: Mission Breakout - based on Tower of Terror, though the DL version works a little differently
WEB Slingers
Radiator Springs Racers - this is like a massively bigger Test Track
Luigi's Rollicking Roadsters
Incredicoaster
Inside-Out Emotional Whirlwind
Silly Symphony Swings - though this is an off-the shelf "wave swinger" ride
Jumpin' Jellyfish
Golden Zephyr
Goofy's Sky School
CA Similar but not exactly the same:
Mater's Junkyard Jamboree - the same as Alien Swirling Saucers
Grizzly River Run - longer version of Kali River Rapids - definitely a wet ride!
CA Exactly (or basically) the same:
Mickey's Philharmagic! - smaller screen though
Turtle Talk with Crush
Ariel's Undersea Adventure - same as Under the Sea: Journey of the Little Mermaid
Jessie's Critter Carousel
Soarin' - though note sometimes they run it with the original Sorain' over California, in which case it is a
must do!
So, you might find you can skip some of the
exactly or basically the same rides to save some time and fit in CA. Hopping is so easy at DLR since both entrances are right there. I mean, sure, Guardians is basically the Towwer of Terror mechanically, but it is also so different and incredibly fun in its own right. I get it though - it's a lot to cram in. I think you could do it, but you'd be running crazy all day, and that may not be as good as just enjoying it all at a leisurely pace. Disneyland is in the details, so take it all in. That said, Carsland though....!

I'm sure you'll have fun however you do it.