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I too would suggest the method by @colleague with a small exception...

Just create 1 wall, convert it to a smart object, THEN duplicate the smart object a further twice.

This will create instances of the smart object.

Unfortunately Adobe, as usual, don't conform to the normal terminology for copies and instances so you may see these 'instances' called 'copies'....they are not however a copy of the original but an instance.

In other words DO NOT use LAYER > SMART OBJECTS > NEW SMART OBJECT VIA COPY

Use CTRL + J, or ALT + drag 'n' drop...anything but the above.

Transform the duplicates as @colleague described to create perspective in the two duplicates...one left, one right.

Now when you change the contents of ANY one of the three smart objects ALL three will change, not just the one...because they are 'instances' of one another.

The two duplicates will keep any transforms you have applied to them regardless.

Regards.

MrToM.