They were both just labeled pink when I got them... Except for the degree of pink, they look identical to me. Will they become more pink with better lighting?

I am not familiar with all the many cultivars of aglaonema and TBH a lot of them look the same to me, but I think that those are 2 different cultivars

in general pale pink ags will get brighter pink and more of it in weak part sun (early /late sun) or with better brighter diffused light.
it is possible that the pinker one was grown in better light but is the same cultivar. you can try giving more light to the 2nd one and watch if new leaves get more pink and become more similar to the 1st one.