It's the first article I could find that referenced the twins in question. But researchers said they were surprised how much impact upbringing had. Unlike a lot of twins separated at birth, these were raised in very different socioeconomic circumstances.

Project about them: http://drnancysegaltwins.org/bogota-twins-project-gallery

The best reference I can currently come up with is this comment by tokenadult who has a longstanding interest in twin studies:

https://news.ycombinator.com/item?id=10100109#10100644