Yes I noticed this the painful way on my exodus from FRA.
First ICE was beautiful newish and had power ponts all over the place.
Even prototype radio Internet was on that train.
Then half an hour later I had to change to a thing that they refered to as
ICE as well but had no similarity with the train I just got used to .

Same on the Swiss railway system - still have not figure out how to make
sure to be on a new double decker car with in seat power instead of ending
up on a pre WWI hog.