I'm just assuming it is for a couple of reasons. 1) it has the newer Amiga logo in the left corner of the case (not the Commodore one) - the one with the red square over the "i".
And all of the manuals use the same.
Plus when I opened the case to install the HD and accelerator board, a date stamp of 1995 was on the inside. Commodore was done by then already.
But to be clear I never have problems with reading disks just unformatted ones, which I can fix with the longer format command. But the symptoms sound similar.
I haven't ever been able to share a floppy between Amiga and PC, which I know is possible. I just haven't tried to work that out... Most of the apps I want to pull over are seemingly larger than 880KB. Maybe I'm being lazy.