They are not bitmap fonts, but they are rendered on screens using pixels. On a typical 96 dpi laptop screen, the pixels end up in the same place.
It's easy to examine precisely how the faces differ, or don't. In MATE or Gnome2, set one face as the default monospace font, and set the terminal emulator to use the the other face. In the terminal preferences page, rapidly flip the toggle that chooses between using the two, and watch which pixels stay the same, or bounce up and down predictably.
Plagiarism is not possible with typefaces. Any typeface may be based on any other, although it's courteous to acknowledge one's sources, and to name yours in a way that prevents confusion. (Otherwise we might call SCP "Inconsolata Squat".) It's possible that both are derived from a common source. Raph acknowledges debts to Consolas and Bitstream Vera, among others.