Not those in the 6xxx range. The lower numbered offsets, all the way up to 3FFF, are all standard FSUIPC offsets, with the exception of a small block at 04E0-0560 which are Project Magenta, and date back to FS2000 days when most were actual parts of FS itself.
Project Magenta is the only exception in that area because it was developed in those times when the range of values was so restricted. We found that area was unused in FS2000 so used it for PM.
This current thread has some lists, or references to lists elsewhere, which include long-standing known FS / FSUIPC offsets published with full details in the SDK, yet annotated as if they are newly discovered and / or questioned. I was just trying to save folks work in understanding those.
Maybe what is actually meant in these lists is that they may or may not be applicable to the PMDG aircraft, which of course does its own thing in many areas (like the MCP) and so doesn't use FS values in those areas.
Regards
Pete