Different memory clocks in 2 HD 7770 GPUs

Hello all,
I acquired a 2nd 7770 for my system. This one has slightly higher clocks than the one I had before. The older one is HIS and the newer one is Gigabyte. Question is, can I set the new one at a higher memory clock than the old one. The HIS I run at 1075 GPU clock and 1250 Memory clock. The Gigabyte at 1075 GPU clock and 1350 Memory clock. It has been stable thus far. Is there any benefit/issue to doing this?
Many thanks