Our upcoming 4.0 release of JFBConnect will have much richer support for K2 for automatically inserting Like, Send, and Comment boxes to all (or some) K2 content. Right now, it can easily be added using our Like/Comment modules or easy-tags {JFBCLike}, etc.
As for conflicts, we can't make guarantees about anything, but will guarantee you that our support is excellent and can usually help narrow down and fix conflicts quickly. We also have a 30-day money back guarantee in case you can't get it going how you want it too.
Hope that helps answer your question, and should you have any others, just let us know!
Alex