[Hat tip BA]
Read the article here
Amazing is a word that comes to mind.
That being said, the theological conundrum of “what quality of Neshama does a Ger Tzedek have/acquire”, is a deep question that involves the likely diametrically held views of the Kabalistic Zohar vs the Rational Rambam (according to many) and their takes on various Talmudic/Aggadic texts. A wonderful article by Rabbi Chanan Balk should be read if you are interested in that topic as well.
Two excellent articles, in summary, that are well worth your time reading in full.
[ I note that Reuven Hammer, a favoured rabbi of conservative/masorti types, recently made waves about equality of neshamos in a different context. In that, he opposed the Zohar and Baal Hatanya and others, and used the alternative view given that it aligns with Western sensibilities of “equality at all costs”—a concept which has been the (warning the hyper-link points to a conservative response) catalyst of many non Orthodox groups.]