Using designer with 6.1/6.5 PRT?

Is it possible to use the 7.1 designer to develop processes for 6.1 or 6.5 backend?

I notice it is asking for the Process Audit database in the Designer settings… it never asked for this in Modeller, so I am wondering if they have completely changed this aspect in 7.1.

Also anyone know where I can read more about the chanes to BPM/PRT in 7.1?