I suppose you could ask the CAA, FAA or similar why it matters?
A Level D FFS is supposed to represent the original aircraft as accurately as possible. If the ADF tone is 400Hz in the UK and 1020Hz in the USA it should be accurately represented in the simulator. Otherwise the device is imparting negative training at some level, whether it matters to you personally or not. Learning to hear the difference between a DME ident (1350Hz) and an ADF at 400Hz probably is important to some.
- GY