Questions about Apple Nike sports bracelet

Yes, the strap is original Apple. It is a Nike sports strap made from high-performance fluoroelastomer, compatible with the Apple Watch, manufactured and sold by Apple itself.

The strap with a 41 mm bridge width is compatible with the Apple Watch Series 8, which also has a case size of 41 mm. However, the Apple Watch Ultra has a larger case with a 49 mm bridge width, which is why this 41 mm strap does not fit. The strap is specially designed for models with a 41 mm bridge width and is therefore not compatible with the Apple Watch Ultra.

Unfortunately, neither the 40 nor the 44 mm bracelet is compatible with your 42 mm Apple Watch.

Yes, according to my research, the band is compatible with an Apple Watch Ultra 2.