Does iTunes restoration cover the data on my new phone?

[Zhengrong Zhao]

I have used my new iPhone for a month and find that I have backed up my old phone in March with iTunes, so I want to restore these files to my new iPhone. Would iTunes clear the data in my iPhone first? I don't want some of them deleted.
Can you help me? Thanks a lot.

 

[Just_Me_D]

Yes

Important: Restoring iOS software on iPod touch, iPhone, or iPad deletes all your information and settings.

Source: https://support.apple.com/guide/itunes/restore-to-factory-settings-itnsdb1fe305/mac