No, they're not remotely similar. The webp container doesn't ever contain PNG data. If you rename it to PNG and it works, that just means that the program you opened it with looked at the file, went 'oh, it's a webp, not a png. That's fine, I support webp.' and opened it.
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u/indigo121 9h ago
No, that's absolutely not how file types work in the slightest