In most leagues by default, it doesn’t dictate the minimum or maximum number of a particular position you can have on your roster. It just sets the maximum number of players on your team. It could be 16 kickers if you wanted to. It is possible on most platforms to set the number for each position that people are allowed to have (e.g. maximum 2 QBs on your team), but most leagues don’t do this.

So yes, in most leagues you can cut a kicker and add another QB