In relation to the Replicant 100, all that surrounds this that is not made known to the Consumer, is the Companies IP and this information may never be offered at a level where the source of the information is the undoubted authority on the matter.
Any other speculation is 'here say' and can inaccuracies woven into the descriptions being offered.
As said before the critical dimensions and Tip Shape 'may' be the only safe method to carry out the comparisons between the differing Styli from the Brands referred to, but are these dimensions on offer from all parties about their product ?