Color change was one of the drawbacks why we did not pick Br Cherry. AFAIK, the difference between the two in terms of light sensitivity is day and night. It was clear from the sample display cabinets where Br cherry had noticable color diff in the area exposed. But santos and most others had none.
Source BR111-
"Cabreuva’s color is mostly unaffected by exposure to light."
"A photosensitive wood, Jatoba's original color darkens to a deep red with exposure to light. Color stabilizes approximately three months after installation."
Source
http://www.exoticwoodflooring.com
"Santos Mahogany undergoes a slight degree of color change with a
slight muting of the color range over time"
"Brazilian Cherry will change dramatically over time from the yellow/tan/salmon color when freshly milled into a deep rich reddish color. In direct sunlight, the color change will occur within a few days. Out of sunlight, it will oxidize slowly over six months. Water based finishes tend to retard the color change while oil based finishes enhance it."