A pack of good condition lipo's should produce very similar power right upto the cut-off point; whereas a pack of older, well used lipo's will not and a gradual loss of power may be noticeable.
I'm currently running the same lipo's as mentioned above - nearly 2 years old now and still pretty good
these are slightly newer, but no real difference that I notice.
It should be noted that even when new there was
never any noticable difference in power despite the 60c difference in discharge rating.