Some Halachic backgroud:
One is not allowed to lain Megillah from a sefer (non Klaf). However just like a Megillah that is missing some letters or even words (or even an entire Pasuk) is still valid (SA 690:3), and one can read those letters and words by heart (ibid), one can also be read the megillah Via Shomaya K’One from the Klaf, and read “some words” Ba’al Peh. (catching up to where the Koreh is), as long as Rov is read from the Klaf.
However, an entire “Inyan” can not be left out of the Megillah, so it can not be read Ba’al Pah, so it can’t be made up either.
As usual, ask your LOR for actual practice.