You
can swap animation curves between two channels. Swap works in conjunction
with Copy or Cut. You can also swap single keyframes but not a group
of keyframes.
To swap two channels:
Select the first channel to swap.
Click Cut or Copy.
The selection is copied
to the clipboard.
Select the second channel to swap.
From the Curve Functions box, select
Swap.
The selected channel
is swapped with the channel in the clipboard.