Does heroin have the same effect as zanacs?

I am assuming you mean XANAX (or alprazolam, the actual chemical--or "generic"--name)? If so- no, they do not act in the same area of the brain and have different effects. Although they are both central nervous system depressants and do have someoverlapping effects such as the ability to induce euphoria, lower heart rate, reduce anxiety (although xanax is more effective with this, see below), and treat insomnia.

Heroin: Part of the class of drugs called opiates.Heroin acts on the opioid receptors in the brain. Naturally, endorphins will "plug into" these receptors when we experience pain; although heroin and other opiates cause exponentially higher pain relief than endorphins found naturally in our body. Primary effects include: euphoria, a "rush" (when injected), and pain relief or analgesia--but also causing antitussive effects, treatment of diarrhea (often leading to constipation), and reduction of anxiety & insomnia.

Xanax: Part of the class of drugs called benzodiazepines. These drugs act on GABA receptors in the brain. Unlike heroin or opiates, these drugs act in a similar fashion to alcohol (although with less negative side effects) and barbiturates. Effects of Xanax & benzodiazepines that are unique to non-GABA acting drugs include: amnesia, more profound ataxia (decreased coordination) relative to heroin/opiates, more profound anxiolysis (reduction in anxiety) relative to heroin/opiates, more profound central nervous system depression (lowered heart rate and hypotension) relative to heroin/opiates, and more profound induction of sleep/drowsiness relative to heroin/opiates. Xanax can produce euphoria, although at a lower intensity than that of heroin--or even other drugs that effect GABA receptors like alcohol or barbiturates. Additionally, xanax does not produce a "rush" like intravenous injection of heroin does, nor does it have any painkilling or analgesic properties.