Do I understand correctly that Scott Aspect 700/900 series use the same frame and the difference between the 910 and 960 are in other components?
With the lower to mid range bikes I believe they use Alloy for all frames.
900/910/920 in some ranges (e.g. Scale and Spark) are Carbon and there are a couple of different frames in these high end products, so you need to do homework to know the differences. Lower end bikes such as 960 are Alloy, which I understand is the same frame speced with different components.
In the soft tails - such as the Spark, the mid range use an alloy rear triangle and carbon main frame.
The pages you linked to both say "700/900 Alloy Frame", and they look identical in geometry and tube sizes, so they are very likely functionally the same.
I notice the higher spec bike has internal cable routing though.
Update: after a closer look at the pictures of the bikes, several small differences can easily be seen, in addition to the internal cable routing.