No - although it is kind of invisible, the scoring in play-off games and qualifications uses the same set of rules as in group matches, so 3-0 or 3-1 win gets 3 points, 3-2 win gets 2 point, 2-3 defeat gets one point, and 0-3 or 1-3 defeat gets 0 points.
So a 3-0 win and then a 1-3 defeat would be interpreted as a draw, because each team would have won 3 points for the match they won. In such case, a special "golden set" is played to determine the winner. It plays like a regular tie-break, you have to score 15 points to win, having at least 2 points more than the opponent. -the rule is actually quite similar to the extra time in football. The same rule applies if you win 3-2 and then lose 2-3.
So basically to qualify to the next round, a team has to win 3 sets in the first match, and then another 2 sets in the second leg.