Differences in /etc/rc between two different 14.x upgraded to 15.0

Simple question: is it safe to replace an existing /etc/rc with a fresh one coming from a more recent installation? Assuming, of course, that the original on was not modified at all during the years...

I just noticed that my test VM (installed as 14.3 and upgraded to 15.x) has a different /etc/rc than its host (installed as 14.1 - upgraded to 14.2 and then 14.3 and finally upgraded to 15.x).

I started modifying the one on my main laptop but I decided not to as the differences are too big.
 
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