A sister or brother religious is ontologically the same as a layman or laywoman. Only priests (bishops are also priests) have been enabled to continue the mission of the apostles, forgiving and retaining sins.
I disagree with the logic that Confession is less beneficial for women since they don’t have the complimentary gender that a man would who is confessing to a priest. Is it more readily natural? Probably; I wouldn’t doubt it. Just as I don’t doubt that there are more women in the world with devotions to Mary than there are men, but just because something is more readily intuitive doesn’t mean that it’s automatically better. I’m becomingly increasingly convinced in my devotions to Mary that I am perhaps privy to a unique intimacy with her as my mother that a female does not have, precisely because Mary is a woman, and she reflects that other half of man. It started out clunky and awkward and unmanly, but now it’s as though I can just feel her love for me melting through the picture and reaching out for me. I am absolutely positive that my time with her is changing me and expanding me.
God created mankind as an intentionally incomplete creature, with one half missing. Gaining communion with this other half can be challenging, but it is also extremely rewarding. There are many holy women throughout the centuries that developed an intense fondness towards Confession, and would gladly speak to their priest over just another fellow nun or laywoman. The comfort of speaking to the same gender is, at the same time, a limitation you are placing on yourself.