Everyone might already know about this, but I recently re-discovered this pigment database and also discovered a feature that I wasn't aware of before. It's "The Color of Art Pigment Database"
It has what appears to be a comprehensive table of all pigments listed by their "Color Index" number. For example PR264. Since there is no standard naming convention amount paint manufacturers, their marketing departments decide on a snazzy name. The database lists all of these names that it knows about. PR264 Pyrrole Red Rubine has about 25 other Marketing names!
The feature that I wasn't aware of is that among these Marketing names are link to the company that make the paint that uses that name. So I found that Royal Talens, Blockx, Schminke, M Graham, Winsor Newton, Chroma, Daniel Smith, Liquitex, Golden, and Holbein all make a paint with PR264 pigment. I also found the Kremer Pigments sells the dry pigment.
The best source I've found to identify the pigment color index used in a given paint is the Dick Blick website. I find the manufacturer and hue I am interested in and then go to that color's page by clicking on the color's part number. There I can find the pigment information including the Color Index number. Then I can use the "Color of Art Pigment Database" to see who else uses that same pigment.
You might not find this to be exciting, but I did! LOL Here's the link.The Color of Art Pigment Database: Pigment White, PW (artiscreation.com)