You cannot add a Spectrum data source to 2 separate CAPC instances, in PM 2.5, or any previous version
The Spectrum OneClick server stores the uuid for the CAPC system, and can only connect to one, as a data source
Also, just for your information, I have included a link to an article, listing the maximum number of each data source, that can be used
https://wiki.ca.com/display/CAPM250/Maximum+Data+Source+Instances+Supported