Ear speaker replacement, keep Face-ID?

From what I understand if you change the ear speaker you will lose face-ID. but if you move the cable over to new earpiece will the face-ID be ok?

does it need to be soldered back on or can I pull it off old earpiece and put it on the new one?

Since you can buy earpiece with and without cable…

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Are these solderpads or "gold contacts" ?

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