Terrain Guru Needed

[Allen42ACJ]

See if this helps.
2 different pitches.The vertical rafter depth is different,so the steeper longer rafters are bigger where gravity is pulling from,straight down.
So a longer rafter is just as strong as the shorter one.

The span is how far the rafter is covering,half the house in this case..
When you figure for the weight that can go on,snow load,what falls off is not figured in..

I might not be the best one to explain it..
Try asking the question on CT..