I think that one of the difficulties in discussing the differences across cultures on the level of "buddhist teaching", is that what we may call the "sample groups" in both (or more) cultures are not necessarily on a par. eg. to take a group of Thai or Sri Lankan Buddhists for example, they may largely reflect a general sample of the Thai or Sri Lankan population as a whole. However, to take a group of Western Buddhists, more often than not, they are not that indicative of the population as a whole. It is sometimes the very non-norm characteristics of some Westerners that makes them look into Buddhism in the first place. On the other hand, a sample population of Western Christians may be more normative. So, I don't think that we can necessarily extrapolate any findings to the differences between cultures as a whole. As time progresses, and Buddhism becomes more normative in Western society, things may change viz this point, somewhat.
I also agree with MikeNZ, about "Asian vs Westerner", as if both were largely homogeneous groups. Both groups include a large range of different cultures. Maybe we may wish to narrow it down here to "Thai vs North American (?)". My own experiences as a Kiwi in China (where Taiwan, the PRoC and HK all also all quite different in many ways) doesn't suggest some of the points raised above, for example.
My recently moved Blog, containing some of my writings on the Buddha Dhamma, as well as a number of translations from classical Buddhist texts and modern authors, liturgy, etc.: .