The thermal balancing is the hydraulic balancing under real conditions.
The system or the functionality of a modern water-based heating system with radiators or underfloor heating is always the same regardless of losses; thermostats at most serve to compensate for solar gains but not to regulate the room temperature.
...I have now measured. There are plastic threads on the valves. Three photos follow. Can you tell me what diameter is necessary for new actuators (or for adapters) here?