[Grammar] the difference of the replica,knockoff,fake,imitation

[applenew]

:roll:i find the replica handbags, knockoff handbags, fake designer handbags, imitation designer handbags or mirror image handbags which are all referring to the same thing and can be use interchangeably. These products are modeled after the original. i have a wonder of the difference of the words,who can tell me the difference?thanks a lot !!:

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[Tdol]

They can be used interchangeably. I think 'knock-off' may be used to imply not very good quality fakes. I haven't come across 'mirror image' with this meaning, though.