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We do not know, other than the fact the Doctor on numerous occasions ("Castrovalva", "Time and the Rani", "The Day of the Doctor") has stated that regeneration is a lottery with the outcome unknown. There are two previous known cases of a regenerating Time Lord taking the face of someone they encountered previously: the Sixth Doctor from Commander Maxil in "Arc of Infinity" and Romana from Princess Astra in "The Armageddon Factor"; Romana using Astra's face is discussed on screen in "Destiny of the Daleks", while the Sixth Doctor's era makes no on-screen reference to Maxil.