They are very distinct. They intersect at one point - long-standing bugs. One addresses bugs caught earlier and earlier in the development process, and the other bugs introduced later and later in the development process.
Even as they are both live for less time, it shouldn't be too hard to see how they could wreak different amounts of havoc. Or not! We don't know! There's no data on it!
2Morendil
So if you came across this story in the field of infectious diseases, you would accept the later reporting as unproblematic, and not update at all in the direction of doubting the standard public health policy?
ETA: welcome to Less Wrong, by the way! Don't let the downvotes (neither of them mine) put you off.