There is an interesting Interview over at Tendo box with Brett Tosti, Project Leader for Battle for Naboo. Here's a snippet;
Tendo Box: We understand the game uses the same game engine as Rogue Squadron. What modifications were needed to the engine for this title?The interview is accompanied by some great concept art and a photo of the BFN team.
Brett: Battle for Naboo does not use the same engine as Rogue Squadron. We are using some portions of Rogue's code but the majority of the engine is new. This was necessary to accommodate ground combat as well as air combat. We also wanted to have further drawing distances and more detail in our environments. These new features required a new engine. .