Having both mods installed will lead to a CTD when switching to the Curve option on the builder. Uncertain on the technicality as to why, but at least for now, it seems like you have to pick one or the other.
Both are great mods I can't live without and I was eagerly waiting for Curve Builder to get a 1.1 update, so I hope to see them working alongside each other if at all possible.
Solution
I think it should now be fixed...but please let me know!