How well do Storyline 2 and 1 play together?

A client may have another external vendor create some interactions for a course I am developing in Storyline. The other vendor is using Storyline 2. What happens if I import a slide created in Storyline 2, into my Storyline 1 course. [For reasons, I won't go into, the client needs me to develop and publish in Storyline 1.]

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