I have two streaming stick 4K's.
One is on software 15.0.
The other is on 14.6.4 - but when I go into settings and check for an update, it says I'm up to date.
Is this known behavior?
Also the device with 15.0 has a problem with the Apple TV tile disappearing even though the app is installed, so Roku engineering may want to look into this!
Yes - RokuOS 15 hasnt been officially announced or released - its still in beta testing, which is why one of your devices has it (selected for testing) and the other doesnt (not selected for testing).
Once OS 15 is officially announced and released (a build is determined to be stable enough) you'll be able to manually update both (if necessary).
The "disappearing or missing app tile" issue is well known recently and is not OS-version/build-specific (in fact its due to bugs in RokuOS middleware modules), though it does need better handling by Roku software engineers to (finally) quash it.
