There is... but one of the problems with the sport of sailing is that there are so many variables and working out what's chance and what's a trend is incredibly difficult.
It's been well known for the last 10 years that the Australian manufacturer builds notionally "better" boats (stay stiff for longer, less likely to leak or crack etc), but there are still variances in key measurements which you need to look out for. The biggest ones are hull weight and mast rake (how upright the mast is in the boat fore and aft which has a critical effect on how the rig is tuned and the performance characteristics of the boat).
Boats come off the production line with fittings in slightly different places, different amounts of material in the layup, key parts of the hull not quite aligned the same etc.
There's significant variance between masts as well. The sections are extruded aluminium and over the lifetime of the extrusion die they go from having slightly thinner walls to slightly thicker ones. Mast manufacturers seem to end up with slightly different grades of aluminium as well. This affects the stiffness, a very important factor when it comes to how powerful the rig is with lighter sailors preferring thinner masts and heavier sailors thicker masts.
Competitive sailors will try and measure everything they ever use to keep track of what they think works for them, and then select carefully when they purchase something new.
All this goes against the ethos and values of the class, which is that there's no equipment advantage possible and it's all about the sailor. This is dealt with at the Olympics (and at World Championships for the Olympic categories) by having mandatory supplied equipment which hopefully has been selected so that it's all as identical as possible. For all the competitions you need to succeed at in order to get to the Olympics however, it's the wild west!