Keep in mind .... for the re-branded machines, they are not always the same as the original one.
It may be a specific model that gets re-branded, but often times there is a slight change.
Sometimes that is only cosmetic.
But sometimes too, it may be something functional ... eg. a slightly smaller spring, or a lighter part, etc.
This happens in all industries ..... not just sewing machines.
You may think it is the same ...
..... but there will usually be something swapped in/out, so they are not identical.