I am not sure, if this is the easiest way, but I do this the following way: It looks like you can only copy and paste midi within the same track, but drag to other tracks. So I create a copy of the midi in the same track, then drag it to a copy of the track and change the instrument, like this:
- In the track view double tap the track head of the virtual piano with the lucky take, till you see the edit options, select "dulicate". This will create a copy of your piano track, but without the midi.
- Now double tap the midi region of the lucky take and select "copy". Tehn lelect an empty place on your track, again double tap, and paste the copy there.
- Now drag the copy to your second piano track.
- Tap the instrument in the track head and select a different instrument.