I'm with you on the higher frame rate. I like that look for a lot of footage.
As you add your clips, some software will scale them to fit the project timeline and some will need you to do that manually. Frames will be interpolated to match the 60fps timeline but you obviously won't get any new data as such. Just one frame on your 25fps second will display for 2.4 frames in your 60fps sequence. You'll see a clear difference between the two as you watch which could be uncomfortable but as your's is specifically drone footage, it probably won't be too notice as you would expect that to be graded differently or maybe look more 'cinematic' anyway.