# How could a strong acid have the same pH as a weak acid?

Because strong and weak refer to their tendency to form ${H}^{+}$ ions, not the concentration of those ions.
pH is a measure of the concentration of hydrogen ions (something like ${\log}_{10} \left[{H}^{+}\right]$ if memory serves, but I’d check that before quoting me ... it was 30 years ago I did this.)