Numbering is not use for Queen Consort. Queen Elizabeth II is the II because of Queen Elizabeth I not because of her mother.
Queen Mary was a consort and was refered to as Queen Mary even though there had been two Queen Mary (Queen Mary I and Queen Mary II)
Usually numbers aren't used until there is a second, third ect... Queen Victoria will be Queen Victoria until a hypothetical situation in which Prince William's daughter becomes Queen Victoria II, then Queen Victoria becomes Queen Victoria I.
From the official site Belgium you can see Baudouin is refered without number
http://www.monarchie.be/en/monarchy/history/index.html
From the official site of Spain you can see Juan Carlos is also refered without number
http://www.casareal.es/ingles/sm_rey/index.html
so I am not sure who you are refering to when you say that these two men have numbers added. Maybe you can post a link.