Charging new iPhone 14 pro max
Can I use old charging block (USB) and lightning plug without harming new iPhone?
iPhone 13 Pro Max
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Yes. Apple encourages it. See the following from Buy iPhone 13 Pro and iPhone 13 Pro Max - Apple
We encourage you to re‑use your current USB‑A to Lightning cables, power adapters, and headphones, which are compatible with these iPhone models. But if you need any new Apple power adapters or headphones, they are available for purchase.