The Minstrel and Liberty 23 hulls, keels and rudders are identical. Below decks they are also the same, except that the Minstrel has an essential mast support. This slight inconvenience is countered in some boats by using it as a table support. Likewise, despite the support, owners have found ways to organise an infill cushion, so allowing a double berth.
Minstrels are normally faster up wind than Libertys, as they should be since they have single masted rigs and a little more sail area. For the same reasons they are not quite as stiff. Off the wind there is little difference, though Libertys sometimes seem to gain in stronger winds.