DDR3 = dance dance revoltion RAM. Someone thinks they're clever.
The difference in specs for those two RAM sticks is insigniicant.
32 bit or 64 bit?
Dual, tri, or quad chan mobo?
How many ram slots? It looks like at least three.
For 64 bit dual chan, 4 slots, install them in four slots, but put them in the right slots or it won't work right.
For 64 bit quad chan, try doing the same, see if it will run in quad chan mode. If not, sell the two 8gb sticks to get moneys to get two more4gb sticks, install four 4gb sticks.
For tri chan, sell the two 4gb sticks, buy one 8gb stick, and install three 8gb sticks.
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