I found some picture at Stein-Dinse. Assuming they are accurate, the Centauro did indeed have a similar side plate to the V11. I can't tell from the pictures, though, if they were exactly identical.
Centauro:
V11:
The part numbers are very close, though.
Centauro: 01415850
One V11 version: 01415890, another V11 version: 01415830.
Maybe the difference is only the colour.
PS: it seems the Daytona RS had them too:
https://www.motorcyclespecs.co.za/model/moto guzzi/moto_guzzi_daytona_rs 94.htm
And a picture from the Wikipedia
Franken-Guzzista, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons