How to stay in sync with video after changing the fps of the project?

Good day! Nuendo 8, 64x. I have a main massive project in 25 fps. Now I need (surprisingly) to import a new video edit with 24fps into the project. What can I do to prevent any changes in audio events or automation positioning and to keep my audio events in sync with the new video? What will happen if I simply import the new video into the project and change the fps settings in the Project Setup menu?