Many cast members are incorrectly ordered.

I started adding the actors for this movie: https://www.imdb.com/title/tt35669009/ There are people who play multiple roles, in the case of one of them I accidentaly added them in separate entires. He was approved for order 71, but not for 28, so now everyone from that point onwards is incorrectly ordered. Is there any way to correct this all at once, without having to rewrite every number one by one?