So,
... desperate to replace my existing sear due to the fact that I "deleted" my safety be removing too much material from the sear safety arm when trying to re-fit the safety after installing the Angus competition hammer, I went ahead and ordered a pre-B sear from Angus' site. Despite being told by someone at Ghost Products that the pre-b sear is not the same as a Combat sear and that I should order the Combat sear from CZ (which is a pain in Canada) I can report with 100% certainty that the pre-b sear DOES fit the Combat (and Shadow as well). If you put the two parts side-by-side there is a slight difference in the profile of the safety arm but it makes absolutely no difference.
On a side note, for those installing the Angus hammer, in the write-ups on this site Jim Miossi recommends fitting the sear to the safety while Angus says they fit the safety to the sear. From first hand experience with both approaches, either way will work but it's easier to fit the safety to the sear.
