@maskupmelb It can be the exact same material but it could also be 'binning'. If a batch comes out of manufacturing and fails the more stringent test you can use that batch for the lesser product. So it may be that SOME samples of the lesser product pass the higher test but not all.
@maskupmelb它可以是完全相同的材料，但也可以是“装箱”。如果一批产品出厂时未通过更严格的测试，则可以将该批产品用于较小的产品。因此，可能是一些较小产品的样品通过了较高的测试，但并非全部通过。