Compromise u/s 420

Accused - X (Present in court) Y & Z ( P O) Complainants - A, B, C, D, E CASE STATUS - A & B came to record their statements for prosecution evidence. C & D never came despite of several summons. E Took his complaint back at the starting of investigation by Police Accused X convicted with R.I of 3 years u/s 420 Appeal pending before sessions judge. A, B & X are interested for compromise. Query - Is compromise between A, B & X permissible? What are the chances of FIR quashing in High Court? Can D & E come up again in Sessions Court and demand for compromise money?