Hahah they are just fine. They are both beige and white, just the bigger boy is a dumbo, I think you have 2 litters here not 2 brothers, but it won't make any difference.
Dumbo boy is calmer but he might be the one that's more nervous in the end (( noticed you have a cat and rats often instinctively react to a predator being around when they are unsure, new and very young...a lot of the hiding and running could be part of that). Working in the bathroom like this is very good...the rats can explore, get to know you but not necessarily by being picked up, but in their own time...approach, retreat, etc. Bring small treats to the bathroom next time and offer them (cheerios are good, NO yogies)
The active smaller top ear boy looks like he will be fun...he's active, he moves toward you, he's curious about everything...if he's the one you're worried about, I wouln't be worried. The dumbo is quieter (some rats stay still when they are nervous, and I actually would like to see him relaxing and moving around like the other boy eventually...as that is normal typical baby behaviour. He does turn towards you which is good...a truly spooky rat would bolt while out...I think just keep going like this and you'll be fine sooner than later. They are very cute boys...my guess is about 5 weeks old.