Not quite.
The referendum in 1992 was a two-part question. The first question that was posed in 1992 was whether they wanted to retain the current system of first past the post or change it. The second part of that 1992 referendum asked them to indicate which of four options they would prefer if there were to be a change.
Then, at the next general election in 1993, because the majority of people who participated in the 1992 referendum voted for change, there was a binding referendum in the 1993 general election.
The 2011 referendum was an opportunity for New Zealanders to, in the words of the Prime Minister—“check the tires” and decide whether or not, after six MMP elections, they continued to be happy with MMP or they wanted to consider a change. That was also an indicative referendum.