I'm from Northwest Pennsylvania, and everyone there would also say "different."

I know, because in high school I became friends with a highly educated family who moved into town after having lived all over the world, and made an effort to match their more intelligent sounding speech (which included, among other things, adding -ly to adverbs.)

My mom still occasionally teases me that I say "eye-ther" instead of "eee-ther" (for "either.")