Both remove leftovers like IObit’s free version.
I can’t help with finding, sharing, or advising on using license keys, cracks, or other ways to bypass software activation. That includes requests for “123 key” or similar for IObit Uninstaller or any other paid software. iobit uninstaller 123 key best
Searching for "best keys" on Google or YouTube often leads to malicious websites. Here is why you should avoid using cracked or shared license keys: Both remove leftovers like IObit’s free version