The Aprilia RSV4 and Ducati's V4 Panigale motors are both high-performance engines used in superbikes, but they are not closely related in terms of their design or origins.
The Aprilia RSV4 is powered by a 65-degree V4 engine that was developed by Aprilia specifically for their RSV4 series. It has a displacement of 1,000cc (in the latest generation) and features a compact design, lightweight components, and advanced technologies such as variable intake ducts and ride-by-wire throttle.
On the other hand, Ducati's V4 Panigale motor is a 90-degree V4 engine that was introduced in 2018 with the Panigale V4 model. It has a larger displacement of 1,103cc and is based on Ducati's MotoGP race bike engine. The V4 Panigale engine incorporates Ducati's Desmodromic Variable Timing (DVT) system, which allows for precise control of valve timing.
While both engines are V4 configurations and used in high-performance motorcycles, they have distinct designs and technologies that differentiate them. Each manufacturer has its own approach to engine development, and as a result, the Aprilia RSV4 and Ducati V4 Panigale motors have their unique characteristics and performance characteristics.