The same placement means different things in different people. The difference is often more interesting than the commonality.
Two Scorpio suns. Two Saturn returns. Two women both Capricorn rising, separated by a generation. Where do their charts converge? Where do they diverge? What does the divergence tell you about the relationship between astrology and the life that happens around it?
The format works best when the comparison is not obvious. Two Scorpio suns who behaved identically would be interesting only as confirmation. Two Scorpio suns who used the same placement very differently: that is where the analysis goes somewhere.
If the same placement produces different outcomes in different people, then the placement is not a destiny. A pattern of tendency. A set of conditions. A kind of pressure that different people respond to differently based on what else is in the chart and in their lives.
Not determinist astrology. The chart describes a space of possibility. The person is what happens inside that space.
Mira takes the comparison when it involves career arcs or life patterns. Clearest analysis of what structural similarities and differences mean in practice. Ren handles comparisons where the epistemic care is itself part of the content: when the cases are genuinely ambiguous and intellectual honesty requires naming what is not clear. The pop culture translator handles comparisons running through fiction and celebrity.