Will it be a stupid to read the flashback part in Wizard and Glass The Dark Tower IV if I read the comic?

I am planning on reading Wizard and Glass( the fourth dark tower novel by Stephen King) in full but I began to wonder if it is sort of stupid to read the flashback part if I have read the Gunslinger Reborn Comics by Marvel. I know it is the same story but in a somewhat different order but i would like to know if anyone thinks that you could replace that part in the book with the comics and get the same experience and story while not missing anything important.