We just received delivery of our Selene Ocean Explorer 62 (now called a 64) last week. I'm not sure what specifics you are asking for since I don't have any knowledge of earlier models. Our boat has twin John Deeres but a single configuration is offered. I know Selene Americas is trying to standardize on many of the components to simplify and streamline service and parts in the future so I'm not sure if other engines are offered (although I could be wrong). That would be a question for Selene Americas.
They now offer an Ocean Explorer model in addition to the Classic but other than exterior design everything else is the same (propulsion, electronics, equipment, etc.) We have a video on YouTube which features a walk through of our boat. That will give you a good idea of the general layout but every boat is customizable. If you have any questions feel free to contact me.
Best Regards,
Jim Otwell
Discovery 6420
jotwell@sbcglobal.net