Australia / Australian - Polish Passport / Citizenship [10]

Hi,
I was wondering if its possible to get a polish passport/citizenship if both my parents are polish (i know this is possible), i was born in Australia and my parents changed there name when they got to Australia.. but still remains the original in Poland, therefore my surname is different to there surname in poland (Only by one letter, they removed a Z out of it, for easier pronunciation for English speaking people)

Thanks
Dominic