Random Walk with Restart vs. Personalized Pagerank

Are Personalized Pagerank and Random Walk with Restart really the same thing? From this source, it seems to be: http://web.eecs.umich.edu/~dkoutra/papers/fabp_pkdd2011.pdf

I've used the RANKS RWR function and the igraph personalized page.rank function and have gotten different results, but it is not clear to me why if they are the same. If they are different, how precisely are they different?