Yes, at Bartley, if racing we'll single wire.
'05 rules didn't change the hull measurements but allowed twin wiring and bigger sails (12.5sqm -> 15.5sqm and 15sqm (kite) -> 21sqm)
The hulls then developed (because of twin wiring) and bars (racks) replaced wings. Having said that the basic hull shape hasn't changed massively eg Born Slippy (still '97 Rules) and Atum Bom ('05 Rules) are both 'Slugs' but look totally different...except the hulls are the same shape.
Early 1990s boats (correct me guys if I get this wrong) pre-date a 'Rise of floor' measurement rule change and are therefore somewhat different.
Several boats have had successful 'conversions' to '05 Rules eg Cheese Before Bedtime by removal of wings and addition of racks. Loco has wings and is of a shape which prevents conversion to racks but underneath the hull is very narrow and the significant variation from modern hulls (and many Cherub hulls) is because she has more rocker....though much of it is in the bow sections and perhaps less of an issue with maximum top speed than some think. She is very fast in light conditions. It is said tho' that the big advantage of modern designs is that they go through waves downwind. Here's Graham at the Nationals:
http://greensea.zenfolio.com/p998604808/h4029554c#h4029554c (he actually did come out the other side)
The other real issue with conversions is mast position. In the later boats masts have moved back close to the centre of the boat, the jib has got bigger (the main proportionately smaller) and the bowsprit longer (much longer). Have a look at Evo - any boat after SN 3,000 will do tho'
http://www.uk-cherub.org/doku.php/boats/3213NB In Cherubs the Aussies got SN between 2701 and 3000, so there has been a jump from 'Dan's Boat' to 'Banshee Ambulance'
There are 4 modern designs: Ellways 5,6 (The 6 is the Arup Skiff), Biecker1 (Ronin) and the Banshee. The Cherub Daemon is 'just' a Slug development but came 2nd this year at Nationals!