They use different jargon, they love to market themselves on their differences (because why compete on price?), but the fundamentals are really very similar and the skills transfer.
Anyone who’s telling you that Cloud X is vastly different from Cloud Y is either trying to sell you something, or has gotten their knowledge from someone who was selling them something.
I wouldn't blanket block a resume that said "cloud engineer", I'd just make sure to probe that they aren't just an "AWS engineer" or "Azure engineer".
A title I have frequently worked under is “Cloud Engineer”.
I’m strongest in AWS, secondly Azure. But I also am extensively using Linode’s platform and Kubernetes too.
My best friend’s title has also been “Cloud Engineer” and he is exclusively in AWS. He doesn’t really know more about Azure than he needs to get things connected to AAD.
How anyone could know that without asking eludes me. If you’re hiring for a position, you have a responsibility to know.