You'll have to show us a photo of the European rims .
If they are the Danish Black Plastic rims with the 6204 bearings, you need to know that when the european landyachters first trialled the wheels that were being used on Kitebuggies, they were a failure.
the plastic thickness around the bearing housing would distort with the higher sideloads from a landyacht.
The manufacturer then proceeded to produce a rim specifially for landyachts.
its possible that the original rims from the kitebuggys then got superceded , but i wouldn't bet on it as they are listed in the companies catelogue as a wheelbarrow rim. All the PROMO CL 5 yachts in Argentina last year were running the landyacht version of the wheel , but I have been trying to get a batch into Australia to find out if they can handle the heat.
The Brasilian sailors had mentioned that there were some problems with heat and that they had gone back to the Alloy wheels they had used previously.
After a year of trying to get in touch with the company in Denmark Ive kind of given up as they never reply to my emails. Maybe my adress is getting deleted as spam, But I keep emailing asking for a price for 100 wheels.
the price in Europe is between 10-20 Euros with bearings and tyre/tube! which compares with the fallshaws.