Today I went through the Unreal Engine 4 for Unity Developers guide. It was pretty helpful, especially the 'Quick Glossary'.
The first half of the guide was more helpful as it listed Unity terms and components and posted side by side comparisons of the Unreal equivalents (or the closest thing to it). The second half of the guide was not as useful, however. At least not right now. It compared code functions and libraries, which I'm sure would be helpful to some, but I can't just take one look at that and remember how to do everything. I'm much more of a hands on learner. Overall, it's a pretty handy guide. I probably should have started with this.