I do not know much about the various cultivars of weed, so I will stick to the second part of your question. Technically alcohol is alcohol regardless of the source it is from, it's absorption should be similar regardless of which beer you drink (assuming an equal percentage for those beers). You can however effect how quickly the alcohol is metabolized by the sugar content consumed with the alcohol.

For the following example I will assume you have consumed nothing but this one drink all day. Our bodies love to metabolize simple sugars, and will do so over alcohol. It is for this reason that drinking sugary mixed drinks can get you drunk pretty fast. Beer has a lot of complex carbohydrates and those are more difficult to process, this results in more breakdown of the alcohol (aka you get less drunk, because there is less available alcohol to bind receptors that cause the effect).

So if you were looking to see what the effects were upon mixing beer with weed, maybe try drinking beers that have more carbohydrates versus those that have less (there are sites with this information on them like http://www.realbeer.com/edu/health/calories.php ).