Fresh peanuts and NATURAL PEANUT BUTTER are the same thing, the butter has oil added to it to make it into a pastey like texture.
The hydrogenerated oils are in the leading brands like skippy and peter pan, these w/ a host of other ingrediants give its peanut butter a solid form and allow it to stay this way even at room temp. All the healthy fat in regular peanut butter is destroyed due to heavy processing and this is why its not a good idea to consume.
Natty peanut butter on the hand is an excellent diet food or bulking agent. P.B on bread is not a terrible idea, it depends on the individual. For a hard gainer, this is an excellent meal ( w/ a pro shake on the side) for getting in cals. I had peanut butter to everything when bulking, bread, shakes eggs and eggwhites. On the topic of peanut butter making you more hungry, this is also an individual thing. Some it might make full, some may feel hungier. Its a fat and usually fills people up, but a tablespoon isnt a big serv. and its is dense and packs a god amount of cals in a small portion.
Now onto having too many carbs and sugars???? WHAT??? Im staring at a bottle of natty peanut butter right now, and it reads 2 grams of sugar (less than most whey protein supps) and 6 carbs (4 of which are fiber and can be excluded from your carb total for the day). Hmmmmmmmmmmmmm. Not to high for my diet.
Ultimately, its going to come down to your goals and what type of diet your on. But as far as ditching the natty p.b, theres no reason unless you simply dont like the taste.