Per the university marketing website, new orange is PMS 2026C
Edit to say I think I prefer the new shade honestly
Color - Brand Guidelines
In addition to representing the university, our colors were chosen with accessibility and differentiation in mind. Jump to Web Color Primary Colors Illini orange and Illini blue are central to our brand identity and should be the dominant colors used in university designs. Research shows orange...
marketing.illinois.edu
Edit to say I think I prefer the new shade honestly