iPhone whatsapp restore - can overwrite old restore?

Hello,

I've sent my iPhone 11 Pro to the repair carrier in meantime I'm using iPhone 5 until I get my phone back.

I registered to WhatsApp with my iPhone 5 and I can't restore media since there's no enough capacity.

There's an option to skip media.

My question is - If I click on the skip media button and I backup again WhatsApp it will overwrite all my old media? or the new media and conversation will be added to my old backup?

Thanks,

S