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On the first question, I would agree with Dave. There's a risk, but a fairly small one. It's not optimum, and it would be worth your while IMO to take a few minutes and build some variations into the pages. But I have quite a few similar pages distributed across many domains, they do get PR, and have a chance of coming up acceptably high in some searches.
(Does having similar pages drag a whole domains listings down in the serps? I don't know, but I suspect it does.)
What platemen suggests, however, is probably not a good idea. You might get some extra listings for a while, but before long, if they stay similar, google will probably devalue one, and it will probably be the older one, wether or not it has higher pr. And the chances of both domains crashing in the serps right away is pretty high.
Google seems a lot more quick to apply a devalueation when it sees multiple similar pages together on multiple domains, than it does to single similar pages.
If you put enough work into it to make it's checksums different, well, that might get by.
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