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The simple model doesn’t really help with evaluating the output of different models against actual temps. At the margin if you are a modeller it may not matter what the absolute temp is for estimating temp increments. Put this aside. The issue is that we have a range of models that are producing a range of increments in temp that are then being used to assess the uncertainty in model space and from that used to assess uncertainty in future global temps for policy purposes. In evaluating the fitness-for-purpose of the models to use for policy you are particularly interested in the range (aka uncertainty) and what is driving it.
There are no hard and fast rules about organizing a comparison/contrast paper, of course. Just be sure that your reader can easily tell what’s going on! Be aware, too, of the placement of your different points. If you are writing a comparison/contrast in service of an argument, keep in mind that the last point you make is the one you are leaving your reader with. For example, if I am trying to argue that Amante is better than Pepper’s, I should end with a contrast that leaves Amante sounding good, rather than with a point of comparison that I have to admit makes Pepper’s look better. If you’ve decided that the differences between the items you’re comparing/contrasting are most important, you’ll want to end with the differences—and vice versa, if the similarities seem most important to you.