Your best bet is to click on the Car Configurator up at the top and go through the steps. It will tell you exactly what you need.
Yes. They both have similar rain covers.
No they do not.
That sounds like something you could contact Coleman about and they could figure out a way to just send you that part. Here is they're phone # 1-800-835-3278
It is a lightweight, waterproof and very breathable shell. This jacket will be perfect for the conditions you are describing.
Yeah. The tips and baskets are able to be switched out so you should be able to convert it to winter use no prob.