The actual model number (not necessarily just the number on the side, rather the longer number on the manufacturer's VIN label) should contain a code letter or number for which model line.
In 2006, Alfa fifth wheels, a SeeYa! Gold was priced about 25% higher than a similar size SeeYa! but I don't know the difference in details. I was shopping Carriage, so better knew the differences Cameo to CarriLite to Carriage, and for those there were actually some construction differences because the different models were targeting different weight markets as well as price markets.
At Alfa the difference could be just level of trim and household fittings, or it could be something more. In the motorhomes where Alfa had three lines, the differences included different chassis models and capacities.
Tom Test
Itasca Spirit 29B