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The 5w can be used as an iphone13, no problem at all.
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The iPhone13 series supports the previous 5w charger to charge, but the charging speed will be slower, if it is used 5W charger is expected to take 2.5-3 hours to fully charge
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If you have a 20W charger in hand, you can directly charge the iPhone13 series with basically no problems.
Yes, but the actual charging power is only 5W, not recommended. Apple's charger power is only 5v1a or 5v2a, Huawei's current more is fast charge 9v2a, or even higher.