Tomshark

I have a new tire and wheel that i was using as a spare for my 2019 MDX Hybrid Tech. its on the 20 X 8 rim with a 245/50 R20.
I was wondering if i could possibly use that as an emergency spare for my 2024 MDX Advance? I know the 2024 uses a 20 X 9 rim and 255/50 R20.

Does anyone know if that would cause an issue as an emergency spare?. I would probably only use it on the rear if needed.