MAC Peaches (Sheertone) is permanent
MAC Instant Chic (Sheertone) is limited edition (Pret-a-Papier Collection)
MAC Hipness (Frost) is limited edition (Fafi for MAC and To the Beach Collection)
MAC Fun & Games (Beauty Powder Blush) is limited edition (Hello Kitty Collection)
Nars Orgasm is permanent in the Nars range of products
As you can see, Peaches and Fun & Games are pretty similar, Fun & Games has more of a sparkle to it. Instant Chic and Hipness are also pretty identical, Hipness is a bit warmer and more pigmented. Nars Orgasm is similar to MAC Hipness, however, it has a rather glittery texture as opposed to frosty Hipness.
Hope this helped you out Jenny!
Have a great day,