Same thing, also known as a "Novak" dovetail cut......but Heinie doesn't want to use another competitor's name. That is a very common cut for sights on 1911s and that is what CZ Custom is using when they mount non-CZ sights on the slides, in addition to the LPA/TRT adjustable sight which is another different slide cut. You could basically fit any rear sight that uses a "Novak" cut, but would to adjust the height of the front sight to get the POA/POI correct.
Look at the sight they use on the PCR PRO-TEK 1, it is adjustable for height only, but still uses a Novak cut. Pretty sure that is made by Kensight, a leading OEM sight maker, but Stuart would have to confirm.