to be clearer, the official lethal dose per bodily weight for veterinary usage of N wildly differs between animals and some need an intracardial injection.
"70 xans and 100 clonazepam" is meaningless since you are not mentioning the amount of substance in each tablet. There are also immediate action tablets and other with extended release, in which the active substance is combined with another molecule that causes the tablet's active substance to be released slowly.
While the two substances (alprazolam and clonazepam) have sort of similar onset times they have very different elimination times.
In theory a benzo overdose could cause a respiratory depression while you are unconscious. In practice even in intoxications with absurd amounts people just get a very long deep sleep and a long hangover effect after they wake up.
Note too that not all benzos are alike - while they are in the same chemical classification they differ greatly in what they actually do.
Also if you have been taking them for a long time you developed tolerance and they will have a weaker effect. And if you have been taking even longer they affect gene expression, which means the cells will have even fewer receptors to which they can bind.
Even if you take some anti-emetic, 170 tablets is a lot and chances are you will just wake up with a lot of drool on your pillow.
It beyond the scope :-D of forum comments but also you don't know if they end up competing for the same receptor(s) or not and how they work on which cytochrome (the liver thing that metabolises them) and if one induces and the other one blocks and the third one does something else, they end up working completely different.
Note too that benzos can have a paradoxical reaction, so instead of inducing anaesthesia they end up making you very awake, very aware and very weird.
Take a look at the guidelines recommended in the protocols where euthanasia is allowed - they don't in include benzos for a reason :-)