to answer your first question.  i 'm not entirely sure.  from first glance, i thought the SP's regular screen(no light) was extremely dark, darker than the original.  but upon further reveiw,  think they're the same.  but i'm not positive.  i don't have my old GBA anymore so i don't know.  just be glad foir the SP.  as for your second question, i have no clue.  i'm not sure if this post was helpful or not.  oh well...