Took a few measurements of the spring:
Spring length: 267mm
ID: 61.4
OD: 84.0
Coil OD: 11.65mm
No of active coils: 8
The spring looks to be the same as a KYB spring. This is good because I have a 6.0 spring on the '11. Also the fork springs from the Sachs crossover to the 48mm zokes.
Looks like I'll be putting the stock springs back in the '11 and stealing the heavier springs for the new bike. The 6.0 rear should be on the money, the .50 fork springs were always a bit stiff in the '11 but as they were slightly too long they always had 6-7mm preload on them. Maybe if I have zero preload they'll be ok.