Google adjust results based on factors like location and what else you’ve searched recently. You’d probably get the same results as each other if you used an incognito tab. For what it’s worth, google trends shows, “Data is” is searched about 3x more often than “Data are”.

Oh and chatGPT is a chat bot, not a fact bot. It’s not for if you are trying to get factual information, it’s just for writing text that sounds human.