I bought Adobe Font Folio a while back. Today, I noticed I have duplicate fonts, one ending in "Pro" and the other ending "Pr6N" (I am referring specifically to Kozuka Gothic & Kozuka Minchin fonts, if it matters).
Pr6N is a classification of Japanese fonts, to tell the purchaser which character collection they support. What Is Special About The Pr6N Fonts? Masahiko Kozuka has been making fonts since 1952 so his designs may have been released in several incompatible iterations. Nothing is wrong. There's also Kozuka Gothic Pro EL which is a web-available font. Use the one you need.