If you are duplicating, try this: export them only once and in the blueprint create two Static Mesh Components; set one to Static/Stationary and other to Movable, then assign the static mesh you want for that instance.
Assign them at begin play or in construction script.
And you you’ll be able to change them in the editor.
Slight change to the above if you want to go this way:
This way you’ll only need one blueprint and you can swap out everything as needed. You can even have another blueprint trigger these blueprints per room as the player approaches.