The only way that I can think of using the OOTB Repeat Grid would be by adding "Section Includes" for each one of the individual cells.
So you would need to create an individual Section for each column property and have two layouts with the coloring scheme of you choice referring to the same property. Then use the "When" rule to control wich on needs to be visible at the moment it is called. The tricky part should be how to differentiate between the new and old lines.
I´m sure there is better solution for your case, but for now this one might be helpfull.