My guess is that the amount of heat produced by striking a match (not
burning all its wood) is about 1 calorie or 4 joules. Divide this by c^2
to get the "mass lost' in kg. The mass of a neutron is 1.6*10^-27 kg, the
mass of an electron about 1800 times less. That is what you need to do to
answer your questions.