High protein does seem to help, but can be harmful if continued later in life ... so remember to cut back!
You could also try to regulate feeding. Feed the tiger a bit more than the albino. Good quality pellets will be about as good. Hikari Cichlid Bio-Gold says on the package 'superior growth' ... and as far as I can tell, it is true
Nearly 2" the first month for me. Hikari brand adds vitamins to everything, so, the treats like frozen bloodworms are still healthy for the most part.
Pellets should be a staple diet for any captive Oscar though (quality cichlid pellets that is). It has a balance of fiber and protein that works well for their digestive system. Os don't eat bugs and fish alone in the wild.
I have noticed this exact situation before with a friend's Os. A red tiger grew faster and was more aggressive than a red, they were bought at the same time, and fed just about the same. The albino became greedy at feeding and usually ate more as well, increasing the difference and the problem.
But, also, as OFL says, water quality can be a factor as well. High nitrates (and even traces of ammonia and nitrite) can increase aggressiveness between Os that otherwise enjoy each others company. Too small of a tank will magnify that problem as well.
If you can provide more information, such as tank size, temperature, tankmates, filtration, water change amount and frequency, test levels for ammonia, nitrite, nitrate ... pH, gH, kH if possible ... and any other information you can think of ... it helps with overall diagnosis, just like a doctor asks strange questions sometimes, but the big picture sometimes solves the little problems, and not just the symptoms of those problems.
Take care and hope that your two babies grow big and strong (and get along well).
