Similar in the fact that it's also a DRI, yes. But, that doesn't mean it's similar in it's effects, not at all. It's a common misconception in layman's logic, that if two drugs have a similar mechanism, that they'll produce similar results. This notion fails to recognize the fact that the drugs don't act the same in all parts of the brain. Inhibiting dopamine reuptake in one part of the brain does this and something different in another part of the brain. Drugs also have a lot of other mechanisms distinguishing them from each other. In the case of bupropion, it also acts on the nicotinic muscarinic system and the NRI aspect is much more pronounced. There is also the aspect of in what way a drug acts upon a receptor. Is it a full agonist, a partial agonist, an inverse agonist, a positive allosteric modulator, a full antagonist, a competitive antogonist, etc
This drug produce very different results. I wouldn't really compare them. Wellbutrin feels a lot more adrenergic.