Buy the Sennheiser Momentum 4 Wireless Bluetooth Headphones.

It is the same headphone, minus the part where you cannot actually buy it.

What was compared

1. The other one is not even for sale
The Black/Copper Special Edition page says Currently unavailable with no restock date given. A headphone you cannot order loses every comparison automatically, no matter how good it sounds.
2. A real price instead of a question mark
This one shows a clear $259 Prime deal price against a $554.23 regular price, dispatched straight from Amazon. The Special Edition has no price shown at all, so there is nothing concrete to weigh it against.
3. Same sound, same ANC, no downgrade
Both are the Momentum 4 Wireless with the same 42mm drivers, adaptive ANC and 60h battery, and review consensus calls the sound among the best under $500. Picking the Brown costs you nothing in audio quality.
4. Shipped by Amazon, not a reseller punt
The deal-priced unit is dispatched from Amazon directly, while the Special Edition listing you are comparing it to cannot be fulfilled at all right now. Buying from the seller who actually has stock is the safer call.
5. Yes, the copper finish looks sharper. Buy this anyway.
The Black/Copper paint job is a real draw for collectors who want the limited look on the shelf. Unless that specific colourway is the whole point for you, it is a feature aimed at display, not listening, and we do not think that is most buyers.