Some similis are artificial when the similitude pertains more to accesorization or styling of facial features. It is of course possible to use makeup and brush over facial characteristics in order to resemble someone else, which is just fundamental to movie making, in particular, doubles that are used to sit-in for well-known actors in order to perform stunts. In such cases, the actor and the stunt-double are by default dissimilar such that wearing the same clothes or using the same makeup can make them look similar, especially for the purpose of the scene that is to be recorded. Note that in making two people similar, even some notions of camera angle or posture is involved where two individuals that look completely different otherwise can be mistaken for each-other if they are photographed or recorded from similar angles or lighting that hides some features and benefits others.
The following are just some examples of dissimilar similis that are similar by the former but they do not seem to carry the same facial features. If you want a counter-counter-example, a case can be made that Pruitt Taylor Vince is actually very dissimilar from Alexandru Rogobete but the pattern surrounding the facial disposition around the eyes, including muscles and the dynamics when both individuals are recorded, is nearly identical, which is something that can only be faked by using computer graphics.
In spite of coincidences, we consider these to be entirely dissimilar compared to the rest of the specimens in the similacrum. The reason therefore is that both individuals when de-accessorized look very dissimilar such that the similitude is just purely artificial and pertains more to the apparel being worn or the style that the beard is shaped. However, the facial audiosyncracies between the two do not match at all. As an example, the following is a side-by-side image of both of them with just the facial hair styled differently and they already look dissimilar.
In fact, a point could be made that Brady Matthew Feigl seems to be more related to individuals such as "Small Brained American" (Conner McBee) or even Matthew McConaughey.
Brady Gregory Feigl on the other hand seems to bear more of a resemblance to Adam Savage.
Either way, some of this might also be related to the actual origin of the people, namely, "Small Brained American" (Conner McBee) and Matthew McConaughey seem to mostly be southern Americans whilst Brady Gregory Feigl and even Brady Matthew Feigl are not too far up. Of course, this just means plotting the city of birth, not necessarily lineage or origin in any way.
This section was painstaking to write because news outlets all copy off each other such that very few have any original information with a whole slew of them just reverberating the original information whilst losing facts in translation, just like the Chinese phone. It is yet unclear which one is Gregory and which one is Matthew - perhaps this wiki is the only page on the Internet that labels them both. Unbelievable.
There are others, like a younger Javier Milei, the president of Argentina, resembling Marin Short to some degree, but with the styling helping more than the characteristics.