In order to get a better idea of how the differnet Macbooks perform with after effects, I was wondering if anyone is able to explain the drastically different After effects puget benchmark scores from Macbooks with similarly similar or identical specs in the attached screenshots?
PugetBench would be a great way to find performance benchmarks, but I just don't think it's very reliable, and this is the reason. You can get drastically different results with practically the same system. And that is usually because of settings configured in each of these computers. Different people use different settings.
The computer you are thinking of getting, in my opinion, would be pretty suitable for this type of animation. Especially if you are editing in 24-30fps, I think it will work fine.
However, don't take my word for it. Research a little more on the best laptops for motion animation and investigate if this one is good for you.