linux - Two SSDs,which are exactly same, but sequential write performance varied widely?

I bought two SSDs,which are exactly same, but sequential write performance varied widely? sdb is the first SSD, sdc is the second SSD, and partitions are same(both sd*1 and sd*2)

and the sdb1's sequential write is 223MB/s but the sdc1's sequential write is only 161MB/s

What could be the cause of this?