Not the same.
To be clear: this is an OTA. You install it just like any other OTA, at home or work or in your garden or while you sip your beer or whatever.
In order for the key fob fix to improve your experience, service must do something. It does not take a long time.
However, everything else in it works without service.
If it helps, think of it like the SSP fix for the Air a while ago, where the software was installed at home (and contained more than just audio tuning fixes), but then it wasn’t until service completed the TSC that the improved audio tuning actually worked.
That means that the timeline for doing this is somewhat less urgent; that is, you don’t need to be in a service center to install it. You just need to have service do a thing, after it’s installed, to improve one of those features.
If another update comes along between then and now, you can still install it.
You could wait until your next annual (theoretically) before having service do the key fob thing. Don’t, but that’s what I mean by it not being required to be at a service center to install the OTA.