1965 Dodge Dart taillights.

[Dave Dodge]

Could you swap taillight assemblies side to side.

 

[Kern Dog]

I'm guessing that this is a question...?
The housings are angled to match the angle of the mounting surface of the quarter panel and trunklid.
Short answer....No.

If the mounting holes even lined up, the lens would angle the wrong way.

 

[66Dartdriver]

That is correct. nope.