If two given triangles ABC and PQR are congruent, then how many matchings are possible?

If ΔABC ≅ ΔPQR, then according to corresponding parts of congruent triangles rule, 6 parameters will match:

∠C = ∠R

∠B = ∠Q

∠A = ∠P

AB = PQ

BC = QR

AC = PR