Mr. Adams said this:

"Within practical limitations, the use of filters permits manipulation of panchromatic film to produce effects approximating (his italics) the response of ordinary and orthochromatic emulsions." 'The Negative', 1948, p.7.

To my eye, it's not even a particularly good approximation, but whether or not the difference is worth having both ortho and pan films around is certainly a personal choice. If one is really curious, it might be worth the effort to play around with the materials and make a personal determination. (By "ordinary", Adams meant colorblind film.)