Buy the tool head cable at Bambu. That’s what they sent me after I bought the cable chain.
Yes, that’s the plan. But I have created a support ticket to clarify the situation with contrary shop and wiki entries.
The only difference is the cable covering. The old cable has a glossy black covering and is very stiff when bending it. The new cable has a matte ribbed appearance and the cable is extremely easy to bend. If your cable is glossy black, you should replace it.
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Thanks, for the information. 
I’ve got response from Bambu Lab to my support question. They told me, “it may be blocked in the drag chain operation due to improper installation.” and it seems, that they preparing a cable chain especially for the P1P. I asked to add the information to the wiki.
That’s pretty vague. FWIW, I’m using the cable chain on my P1Ps with no issues (so far anyhow).