Answer:
The main difference between the way the Chilean military came to power in 1973 and the way Hugo Chavez did the same in Venezuela in 1999 lies in the democratic legitimacy in which they did so.
Thus, the Chilean military, led by Augusto Pinochet, came to power through a civil military coup d'etat, by which they overthrew the democratically elected president, Salvador Allende, who defended socialist ideas.
Instead, Chavez came to power initially through democratic elections in which the Venezuelan people elected him as President, although later his government ended up becoming a socialist dictatorship.