Sun Pass and E Pass are the same and can be used on all toll roade in FL. There are 2 versions, one is permenantly afffixed to your windshild and the other is removeable and can be moved from car to car. See step 2 on this page for costs.
http://www.wikihow.com/Buy-a-Florida-Sunpass We use the sticker type Sun pass.
EZ Pass is for up north.