Kbin data not updated in real-time?

I'm new here and getting my bearings on how the fediverse works, and this one has got me stumped. I heard that Kbin is another system in the fediverse separate from Lemmy, but that, both being in the fediverse, they are able to interact. I was just testing this to see how it works, but I'm not seeing what i expected.

I am on Jerboa and I can indeed find Kbin magazines through the search. I looked up the Kbin magazine called Random, but it looked way less populated on Jerboa than on the Kbin site. Notably, posts from 3-4 hours ago or more recent were not appearing in Jerboa. The most recent post on Jerboa is from 18 hours ago on Kbin and has only a few comments, whereas Kbin has a substantial amount more. So the two systems can interact...but is there a large time-delay between them?

Can anyone help me understand how this works? Should I expect to see the same behavior between Lemmy instances?