Again, the results depend on how the channel does its commercial insertions and how consistently they do them. Depending on the exact nature of the commercial insertions, it might be possible to tweak the cut paramaters to make this usually work as you want, at least for a given series on a given channel, and perhaps for all series on that channel. It is not unusual for similar results to be found on more than one channel, either, but OTOH it is also not unusual to encounter rather different results on different channels. I don't have enough experience with this to form a useful opinion. I would not be surprised for it to be the case. It has been my general experience that different episodes of a single series airing at the same time on the same channel are pretty consistent, but by no means perfectly so.