I don't believe that St Augustine was talking about unity at the cost of scripture. In those times, it was much more difficult to obtain original-language manuscripts, and much more difficult to find people who were competent enough to analyze them (as St Jerome was).
Translation necessarily involves at least some change in meaning, and both men recognized that this was just a consequence of translation. We acknowledge this ourselves today when we say "well, let's just look at what the word meant in the original language".
St Augustine seems to have been worried that, in cases where such discrepancies between translations would be subjected to close examination, a schism might result over something minor because "just looking at the original language" simply wasn't an option in those times. This was a very legitimate practical concern. St Augustine would surely have been livid at the idea of changing the meaning of any biblical text for the sake of unity.
For my part, I would much rather that you would furnish us with a translation of the Greek version ... For if your translation begins to be more generally read in many churches, it will be a grievous thing that, in the reading of Scripture, differences must arise between the Latin Churches and the Greek Churches, especially seeing that the discrepancy is easily condemned in a Latin version by the production of the original in Greek, which is a language very widely known; whereas, if any one has been disturbed by the occurrence of something to which he was not accustomed in the translation taken from the Hebrew, and alleges that the new translation is wrong, it will be found difficult, if not impossible, to get at the Hebrew documents by which the version to which exception is taken may be defended.
The Church wants unity, it wants absolutely everyone to be a Catholic, but being true to scripture is much more important. Catholics get their Truth from the infallible Tradition, Scripture, and Magisterium. "Consensus derived for the sake of unity" is not one of those three. The Church is not going to say "well, I guess we can let that slide, some people just interpret things in radically different ways that will lead them into sin and separation from Christ, but we should just respect their views, in opposition to what we know to be infallible, and they'll be more likely to join the Church". This is actually exactly why the Catholic Church has been so adamant in its views on abortion, contraception, homosexuality, female priests, and so on.