My guess is that it would be reverse to ours ? Just as Richard feynman had described about anti-matter.
By the way I just read an article stating the creation of the anti-particle counterpart of Helium-4
The first thought is, it would be the same. However there is some reason, still unknown to us, why our universe is predominantly matter. Was it really just random chance? Without an understanding of that issue, it's impossible to answer your question. There are apparently differences between matter and antimatter which we have not yet discovered. An antimatter universe sounds possible, but may not be.