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...you can submit the JPG, no conversion needed.
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You CAN, but it's better if you don't. Why send an inferior image?
Apple may resize/convert for the App Store. They may change their mind about size/format in the future. Give them a full, lossless image to work with. You are going to lose quality starting with lossy compression like JPEG.
Take a screenshot on the iPhone and email it to yourself. Take a screenshot with Organizer. Zoom in on each one. Which one do you want to send to Apple?