There are 200 ways of doing this (if you don't distinguish between the 2 bunnies when they're on the same tile, 420 if you do).
If you merge together moves involving the same animal there are only 4 (with length 15).
https://gist.github.com/wrbs/5824e9b17c55b5ad3d8467f93e12ed8... (svg graph of the 4)