You can do it, I would not. Your amp's positive and neg. cables should be the same size. So, if you are running a 4 gauge + you should run a 4 gauge - cable too. What you might want to do, is either run an other cable back to the battery or run a distribution block between the battery and amps. Run both amps the to the distro block and then a larger wire to the battery. You also, want to keep the ground wires as short as posible.
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