How do the physical traits granted by the draconic sorcerer bloodline interact with a changeling’s shapechanger trait?

Sorcerers with the draconic bloodline develop a thin sheen of dragon-like scales and can eventually manifest wings. How does this interact with the changeling’s ability to alter their shape?

For instance:

  • Can they maintain the armor bonus of draconic resilience when they are mimicking a race without scales?
  • Can they manifest wings and then change them to match an Aarakocra or Winged Tiefling while still maintaining their original flight speed?