For example I know some people that swear by the 2 milligram Klonopins and charge more for them as opposed to one milligram Klonopins people talk about bioavailability I can understand a difference between Xanax and Klonopin there two different drugs but hey a milligram of Klonopin is a milligram of Klonopin I don't care if you're eating .5 milligram tablets or 1two milligram tablet, what's the difference?
Clonazepam is the generic drug name. Klonopin is the original brand name for the drug approved by the US Food and Drug Administration. I'm sure you know this part.
The difference between eating two .5mg tablets vs. one 1.0mg tablet is most likely going to be negligible in your body, but technically since the pills are the same size, one has twice the ratio of inactive-to-active ingredients, and thus it could potentially cause the dosage from the two tablets to dissolve more slowly, lengthening the onset time of the drug's effects.
This is the Orange Book => http://www.fda.gov/downloads/Drugs/DevelopmentApprovalProcess/UCM071436.pdf
The long & short of it, regarding generic drugs, is the "A_" rated generics are considered bioequivalent by the FDA, and "B_" rated generics are not. So while mostly containing the same dosages as brand name drugs, some impurity or inactive binding agent, or something like this impedes the dissolution of a drug in vivo.