Nope, that won’t work. The older Eagle RDs only work with the 10-50 cassette, officially they cannot even handle the new 10-52 cassette. Newer Eagle RDs accept the 10-50 and 10-52 cassettes. But they do not work with any others.
But you could get a second rear derailleur while you are at it and just change crankset, RD and cassette. 