Can two people have exactly the same Human Design?
Two people can share identical Human Design birth data, but being born at the exact same time and place is extremely rare. Practically, this means matching charts are possible but highly uncommon in real life.
Technically, yes. Human Design is calculated from the exact birth date, time, and location, so any two people with identical birth data will produce identical charts, including Type, Strategy, Authority, Profile, and defined/undefined Centers.
However, the chart itself is only one layer of the system. Two people with the same design can still be influenced differently by transits, environment, relationships, conditioning, and life experience. Human Design itself treats the birth-time imprint as a fixed energetic signature, while personal development happens through awareness and choice over time.
So while a chart match is mathematically possible and occasionally observed, especially in twins or simultaneous births, it is statistically very rare given how precise birth time and location must be. If you do encounter someone with the same design, it offers an interesting mirror, but it does not mean the two lives will unfold identically.