How to restore old WhatsApp backup on new number

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Registration date
Wednesday December 29, 2021
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December 29, 2021
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Hi,
I did my WhatsApp backup correctly in 2018 over Android 5.0.2 (Lenovo A 7000 mobile). Now I have changed my mobile (Samsung A 20, Android 9.0 (Pie)) and using a new phone number also.
Can I restore my '2018 Whatsapp back' to my Samsung A 20 mobile?
OR
If I buy the same old phone set (Lenovo A7000) then can I restore my '2018 Whatsapp backup' using a new number here in this set (Lenovo A7000)?
Your advice will be highly appreciated.
Thanks