Joe Armstrong had a beautiful LEGO vs Meccano metaphor. Both things are cool and somewhat similar in their basic idea, but you cannot do with LEGO what you can do with Meccano and vice-versa. Also, you can not mix them.

But you could create some parts that are enabling you to combine them easily. Which is what you could do with software. Write an adapter of sorts.

Sure you can. Hot glue, E6000, duct tape. This is to say, git's pack format has its shortcomings.