Previous iPhone Dynamic Wallpapers

Hi.

I just (yesterday) upgraded from my beloved iPhone 6 to an iPhone XR (yes, it's been a while), and while I set up my new phone from a backup of the old one and transferred all my settings, including my selected dynamic wallpaper, the other dynamic wallpaper options weren't transferred.

As much as I like the newer, darker, dynamic wallpapers, I'm wondering if there's somewhere I can download the previous ones from. Or can I transfer them all from my 6 to my XR?

I imagine I can change the selection on my 6 and then transfer that to my XR via a backup but I'd rather just have them all stored on my XR so I can change them easily.

Can anyone help? Thanks.