Are my wheels 12 speed compatible?

[cd_davis]

I own a set of Campy Neutron Ultra wheels (rim brakes - 8-10 years old). Searching the web, I get contradictory answers, whether they are 12-speed compatible or not.
Likewise, I own a 2018-2021 range Fulcrum Racing 5 2 Way Fit disc wheelset. It seems that from the Fulcrum website, they are only 11-speed (for Shimano). Both wheelsets have Shimano freehub bodies, with 11-speed cassettes installed.
Can anyone provide more definitive information?

Thanks.
Chris