I have often wondered what it would be like to meet another version of my self, when I thought about it, I realized, that it couldn't be another version of me, unless there was no way of knowing which was the original version, otherwise it wouldn't be me. I don't want to spoil anything, so I will say this, a clone cannot think as another person does unless they have had the same experiences, a big philosophical discussion is avoided by not addressing this issue, but to not address it, the original version couldn't be known. The R&M creators are intelligent enough to understand this, where most show creators are not. The only other person I can think of that was able to think about the world, and manifest it into a television show was Matt Groening. And he actually addressed this "topic" too in Futurama, and it was perhaps the best episodes in all of Futurama.
The point is that this episode, as are many of the episodes, is an episode for the typical atypical Millennial nerd who is now in her/his 30's and still thinks as deeply about the universe as they did while in highschool. It's not an episode for people who enjoy slap stick comedy, or "fictitious" reality tv, it is an episode for those who appreciate philosophical discussion, and thinking about how the universe works.
Without a doubt this episode is a 10.