Phenolphthalein and phenol red are not the same, but they are very similar. I would recommend you take a look at the Wikipedia pages for these chemicals to see how they are different. Here is the webpage for phenolphthalein:

And here is the webpage for phenol red:

Phenolpthalein is very similar to phenol red. In fact, most of the molecule is identical, except for a small group that dangles off the side of the main structure. Even the reasons for the colour changes with pH are the same.