my mac pro has 3 out of the 4 dime slots occupied with 2gb can populate the 4th slot with this 8gb? or do they have to be 2gb through out?

Apple Memory Module 8GB 1866MHz DDR3 ECC SDRAM DIMM - 1x8GB

Apple Memory Module 8GB 1866MHz DDR3 ECC SDRAM DIMM - 1x8GB

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