Yeah you could look at that, but it is would be looking at seperate points to the one I initially brought up. Both Tendulkar and Ponting have very similiar 1st innings and 2nd innings differences (both average 60+ in the first, and low 40's in the second). However, what was found is the distribution of Ponting's runs over his career is different to Tendulkar's. When Ponting scores over a hundred in the first innings he tends to often follow up with a 40+ score in the second - so basically when Ponting scores well in the first innings, it is quite likely he will really dominate in the entire match. However, when Tendulkar scores over a hundred in the first innings, he more often than not doesn't follow up well in the second innings. So Tendulkar is less likely to dominate an entire match if he has scored well in the first innings. However, to compensate, Tendulkar also has more matches than Ponting where he scores moderately in both innings. Ponting will often fail in both innings.
So overall, I don't really think its makes much difference to winning matches - on one hand Ponting will help win more matches when he has scored well in the first innings,but will also probably contribute to losses when he fails in both innings. On the other hand, Tendulkar will be less likely to help win matches when he has scored well in the first innings, but will also contribute to wins by consistently scoring some runs in other matches.
One other interesting point though, is that Ponting (52.44) has a much higher 4th innings (run chase) average than Tendulkar (38.77).