Sure, but there’s different degrees, from a little inspiration to an outright copy.
In this case, I think it’s far towards the copy-end. If you presented a case of OnePlus Buds to the average consumer as Apple AirPods, would they know the difference? I doubt it.
There are degrees but the average consumer is blind to many differences which are only obvious if you're looking for them, or an expert. Debadge one of the many homogeneously designed cars and an average consumer wouldn't have any idea who manufactured it. Line up a dozen laptops from different brands and to many people they look the same.
In this case, I think it’s far towards the copy-end. If you presented a case of OnePlus Buds to the average consumer as Apple AirPods, would they know the difference? I doubt it.