Changes in decomposition with 4.0.1.

I have been using ParMetis for a number of years now, and recently I switched to version 4.0.1 from version 3.1. Previous versions gave me the same decomposition when using the same number of processors, but I noticed with version 4.0.1 the decomposition has changed. I have checked my inputs and they are all the same as far as I can tell. Both of my versions call ParMETIS_V3_PartKway, but one from 3.1 and one from 4.0.1. Both use the default options (at least option[0]=0). Is there something I can do to get the same decomposition with both versions?

In general it does not matter, but for parallel testing purposes on my code I would like to be able to force the same decomposition to compare to old versions.

Thanks,
Jimmy