Most games that originated on the arcade and later became console games were usually ports. However, in the case of PlayChoice 10, all of these games originated on the NES, and were "ported" (but mostly unmodified) from the NES.
So when sehugg thought they were playing an arcade game, they were actually playing a (slightly modified) NES.
Mario Bros. arcade was ported to the NES, and it was modified. [1]