Hey Mark,

Thats an easy one, they are exactly the same! HaHaHa.
I met Angelo and Gianluca at Ozzano earlier this year.
The original plug was made by Angelo Minici from BlueSky Models who sold the plug to Airworld.
Gianluca De Marchi just enjoys the flying!

Airworld remade the plugs as they did not like the method used by Angelo. Angelo's model has a 2 piece wing.
According to Angelo his design is much stronger and never had issues with the wings folding in flight.

I hope this helps. I checked their MB339's out well at Ozzano, incredible detail and all under 20Kg.

Regards,
Brian.