I am collecting circulating coins after 1964, one of each KM number. I am getting closer, but some coins are "impossible" to find, and therefore I wonder wether these coins are "real"?

Two of the coins I have been looking for a long time are these two Egyptian coins:

A424 5millimes 1972

A425 5milliemes 1972

And if they are real, what is the difference between A 425 and A 433 from 1973?