Wow, I never knew Magic Kingdom was bigger acreage wise than Disneyland. I would've thought the opposite. Interesting.
DL and DCA are small I'll admit I was taken aback by the size as I am a WDW vet as well. I called it tight and was scolded by a west coast person( sorry if I offended) It's really easy to go back and forth to each parks as you only go through security from an entrance or from downtown Disney. I was able to see the first show of World of Color leave DCA and head to DL to watch Paint the Night.
Are you asking in terms of acreage or number of attractions? The parks in California are smaller than the parks in Florida (acreage), but they have a lot of attractions in that space. Personally, I think DCA reminds me the most of DHS (in terms of the visual look and feel), but it has a sprinkling of attractions you can find in all four parks at WDW. For example, DCA has Tough to be a Bug (AK), Tower of Terror (DHS), Ariel's Undersea Adventure (MK), and Soarin' (MK).
I recommend checking out HydroGuy's A DLR Guide for WDW Vets to help get a sense of the similarities and differences between the two resorts.
I went to Disneyland.com and WaltDisneyWorld.com and looked at the attraction lists. DLR has 81 things listed and WDW has 112 things listed. Now both of those lists include some things that are are stretch to consider an "attraction" (e.g., Chip 'n Dale Treehouse at DLR and the American Heritage Gallery at WDW), but it'll give you a sense of what DLR and WDW consider attractions. So in that way, DLR has about 72% of the number of attractions that WDW has, but with only two parks.But realistically, does Disneyland have say 50% of Disney World attractions (just counting the 4 parks)? There are only so many attractions that can be put into a smaller area of land.
I went to Disneyland.com and WaltDisneyWorld.com and looked at the attraction lists. DLR has 81 things listed and WDW has 112 things listed. Now both of those lists include some things that are are stretch to consider an "attraction" (e.g., Chip 'n Dale Treehouse at DLR and the American Heritage Gallery at WDW), but it'll give you a sense of what DLR and WDW consider attractions. So in that way, DLR has about 72% of the number of attractions that WDW has, but with only two parks.