One more question

Kingston Hyper-X KHX12800D3/2G 2GB (1 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
Kingston Hyper-X KHX12800D3K2/4G 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600

According to the specs, they both use 1.9v. Could these really be old Micron sticks?