Thats not the case at all.
A change of Col or Leadership is not comparable to a situation of two regiments that have nothing in common except name. The same core of the 15th with mostly the same leadership and same core of players remained, just without Falk. So I don't see how that is in any way comparable to something like Donalds 92nd and Heinrich's 92nd, which indeed had nothing in common but name and perhaps ideals.
If you mean the disband in 2017: when they reformed at the end of 2017 the same core of players that disbanded the regiment earlier that year came back together. Gi, Mels, Moussolini, Luppers, Dayboul, Vortx, Sadman, Monsnic, Carlitos, Amue, Gasset, Dusan, Marley, Jonnyboy, shogunai, firefly. and that's just off the top of my head.