I was unable to directly clone between an FT-817 "unmodified", and an FT817 "modified" i.e. "wide-banded" radios.
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First I downloaded a data-file from the target radio and populated it (copy and paste) with the required entries from a data file downloaded from the source radio. I was then able to upload the edited data file to the target radio. I used CHIRP.
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As another example, I have found that widebanding a VX-6 radio alters its signature, so direct cloning between a modified and nonmodfied VX-6 is not possible.? I suspect the signature of an 817 is not the same as that from 818, so to "clone" between them you need to use the procedure above.
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Gordon VE3JSJ