How to change used WD windows for BPM process instance?

Hello SDN!

We have two BPM processes (A and B) and two WD DC (A and B). Process A uses window from WD DC A, process B uses window from WD DC B.

We deactivate process A since we need process B to be used and since A and B use the same WebService. But existing instances of process A still using window from WD A. Is it possible to switch instances of process A from using WD window A to using WD window B? And how we can do this?

Regards,

Lev.