Q. During one of the days of Pesach I had left over a large piece of Shmura Matza from a meat meal; Next day I wondered if I could eat for breakfast cheese with the leftover Matza. Is that permitted?
A. Shulchan Aruch (Y.D. 89: 4) rules that one should not use the same bread that was used for meat, when eating milk products or vice-versa. Poskim permit when one was careful to place only some slices of bread on the table and separated the remaining ones. (ibid. 91: 4, see also Igros Moshe Y.D. 1: 38).
It is reasonable that the same limitations would apply to matza.
Rabbi A. Bartfeld as advised by Horav Aharon Miller Shlit’a