It should be possible to do a little research and possibly work to find the certificate file locations that the YaST CA module used…
But, it’s unlikely to be of much use.
If you have any certificates managed by YaST, you’d probably have to export them and import into the new management tool, anyway…
I suppose if you have tight security regulation, you’d probably want to revoke those old certificates but otherwise I’d assume that things will work fine if you just issue new certificates, particularly for VPN use.