Because of the similarities between them, the contingent vote and the two-round system can usually be expected to elect the same winner. However, in the two-round system, the voter is permitted to change one's mind from one round to another, even if the favourite candidate in the first round has not been eliminated.
Given that they share many characteristics, the contingent vote and the two-round system usually produce the same outcome. Nevertheless, under the two-round system, voters are permitted to change their selection between rounds, even if their preferred candidate did not advance past the initial stage.