Does anyone know why in 1991 Captain Marvel was a guy?

https://www.tradingcarddb.com/ViewCard.cfm/sid/74959/cid/5576748/1991-Impel-Marvel-Universe-II-139-Captain-Marvel

And in 2019 Captain Marvel is a woman, so is he trans or did they just change the gender?

"Captain Marvel is a 2019 American superhero film based on the Marvel Comics character Carol Danvers." -Wikipedia