How very cute! I always love perc fish pics, they are so much fun. Looks like they are both still male, it will be cool for you to watch as they establish who is dominant and one becomes the female.
Nice looking pair of perc's...I believe its hard to tell how long it'll take for them to sort out the relationship.
Could take awhile or it could happen real quick....depends on the fish. With any luck you may wind up with a kewl mated pair...just let nature take its course....
All fish, even of the same species, have different colorizations. Just like people have unique traits as well. As for my perculas, one became dominant and a mated pair within 3-6 weeks.