The Elements of Harmony are ancient stones that have magical abilities. The Infinity Gems are powerful stones that if gathered together, can give the holder omnipotence. But...what if they are the same? Here's some evidence:
Magic Element = Mind Gem (Twilight Sparkle is the smartest of the group)
Honesty Element = Reality Gem (Applejack is the most realistic and honest of the group)
Kindness Element = Soul Gem (Fluttershy is quite kind)
The other three are just guesses:
Generosity Element = Power Gem (Rarity has been shown to be quite strong)
Laughter Element = Weltraum Gem (Pinkie Pie can break the...