In reply to steveej: I'm afraid it depends on a shedloads of factors... the biggest factor is garment/bag design: if it doesn't fit you then it won't be warm. Similarly, the complex stuff like the down's density in the baffles makes a big difference.
How do you make the comparison? With great difficulty... Sleeping bags at least have EN13537 which should help a fair bit, as in theory the results of one manufacturer should correlate with those of another, but it is very difficult for jackets as there is no standard test. Some manufacturers will get their very warm kit tog-tested (see the recent UKC articles on the subject) but these values are not often made public.
I suspect that the two values you've stated above would be very roughly similar, disregarding the design thing, which as I've said is absolutely crucial.