I'd certainly argue that the 1619 Project is a form of CRT.
As for defining it: CRT is, at its core, the idea that race is the overriding factor in all of American society. That race dictates where people live, the incomes that people have, the opportunities they can take advantage of, the laws that are passed and enforced. It's the idea that race is the single most important factor in a person's life.
The Biden Administration has proposed giving more funding to schools that teach the 1619 project and Ibram X Kendi's work. https://www.federalregister.gov/documents/2021/04/19/2021-08068/proposed-priorities-american-history-and-civics-education