This is generally fine, but the higher capacity cells like the 2700 mAh ones will sustain fewer cycles before they wear out. The only way to squeeze the higher capacity into those cells is to make the parts thinner, smaller and more fragile so that more can fit into the same volume. A rule of thumb is that 2700 mAh cells will tend to wear out after less than 100 cycles, whereas 2000 mAh cells might last for 200 cycles or more. The latest Eneloops are advertised to last for 1500 cycles, but those are special marketing department cycles and should not be taken as an indication of what you will actually achieve. It will however be way more than 60.
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