Yes. Different methods of cooking the same things result in different textures and tastes. Asking for a complete description of the differences is asking too much. 10,000 words couldn't give you the amount of knowledge that a couple of chickens and two hours of experimentation would.
There aren't real, comprehensive answers to the questions you're asking in this thread, because the questions themselves are overly broad. In essence, you're asking for a book.
The physiology of flavors is complex, involving the taste bud, palate and nose. How you manipulate them -- and at bottom, that's what you're doing -- can be still more complex or quite simple. So far the descriptions of taste bud receptors as sour, sweet, salty, and bitter -- plus umami, is still incomplete. Although not one of the specific papillae, HOT! is also a primary sensation occurring on the tongue. When you consider the way palate and purely aromatic stimuli affect the way the brain interprets the taste signals, you've got an awful lot of stuff going on. Then add texture.
The idea of "balance" is very important, so are "depth of flavor," "layering," "brightness," and a score (at least) of other things. You use your experience with flavors, techniques, and your virtual palate (what I call the ability to imagine and predict tastes) to begin the creative processes of developing a new dish or "reverse-engineering" something prepared by some else.
You're questions are interesting, but premature in the sense that you lack the culinary and scientific expertise for the answers -- if anyone could give them -- to make sense. Make your questions more specific to dishes you've actually cooked or would like to cook, and you'll start to see the general rules emerge from the welter of specifics and exceptions. At the moment it's like talking to someone who's just started his first algebra class, asking how to solve three-body, gravitational problems.
The more specific you are, the more likely you are to get meaningful answers.
BDL