How about visa for dependent? do i need to refile visa for dependent as well if my sponsor changes?

Hi, 1. I am working for employer X and have a approved 3yrs Skilled visa and its valid till year 2024 and if i switch a Employer B in skilled visa, do i need to pay for same fees again. 2. If i want to switch to new employer do i have to pay for 3 years visa fees only for Myself again and not the de...