Rolls Royce Eagle at Derby

On a recent trip to Derby I visited the Silk Mill which is currently being turned into ‘The Museum of Making’ They have on display a Rolls Royce Eagle engine which the display boards tell us is one of the two that powered Alcock and Brown’s Vimy across the Atlantic. This surprised me as I had always assumed that the Vimy has its original engines. Can anyone shine a light on the truth of this matter?