From the specifications:

Manufacturer's Part Number: SPK8

Box contents- LG SPK8-S 2.0 Wireless Rear Speaker Kit
- Manual
- Wireless speaker reset guide
- Rear speaker cable
- Warranty card

https://business.currys.co.uk/catalogue...

One is the part number the other is the speaker kit, both refer to the same thing.

Unfortunately, I only have these speakers. It's best to ask customer service.