There is no upgrade from NPC to CAPC.
PM Performance Management has two components CAPC & DA Data Aggregator.
CAPC is not a product on its own and only a component of PM.
DA is the SNMP data collector portion of PM.
For a list of devices and metric PM supports by default see this web page:
Data Aggregator Certification Portal
documentation is here:
CA Performance Management - Source Home - CA Performance Management - 2.5.0 - CA Wiki
UIM Unified Infrastructure Management (formerly Nimsoft) is the other option for a NV replacement.
It has Probes for SNMP and many other types of data collection.
documentation is here:
https://wiki.ca.com/display/UIM83/CA+Unified+Infrastructure+Management+-+8.31
Neither PM or UIM have a provision for importing NV data. It will be necessary to evaluate what types of data NV is collecting and what customization you have for alarms, notifications, groups, reports and views, and then compare that to what the other products have by default and what will have to be added.
Once you are ready to cut over to the new product NV will need to be left setup to keep the historical data available. For that see this Tech Tip.
Tech Tip - Setting up NV for historical data only
https://communities.ca.com/docs/DOC-231149130
RA 9.0 is way past EOL and will work only with NPC. It has morphed into NFA Network Flow Analysis. The later revisions have functionality added so it can be used independently or integrated with UIM.