I have both.
Cheap one has an extra flange around inlet end - maybe a different/additional mounting option. Both mount identically in our rubber block system, and electical connection is identical.
Cheap unit does not have Bosch etc info on outlet end face
Outlet pipe on cheap one 25 mm vs 20 mm long, - same diameter - on genuine. No problem
Both have identical markings viz:
>Cu Fe<
>PA66-GF25<
on side of body (see second last photo below in @Pale Horse's post)




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