My wife can't differentiate either. Doesn't even notice when a new bass appears. There was a time when I only had solid color basses, and a sunburst Sire arrived. After a couple of days of it hanging on the wall of the home office we shared, I made an allusion to "the new bass," but she hadn't noticed that the sunburst Sire had taken the place of a black Squier.I had my wife stare at that pic of beautiful lefty basses and asked her, "Okay, can you tell what makes these basses look different from my basses?" She stared for 30 seconds and said, "Um...the shape?" In all fairness, she is a vocalist and a pianist. She never thinks of lefty microphones or lefty pianos.
Another time I tried to explain how each one had a different pickup configuration better suited to this or that type of tone or music. I think the explanation actually pained her.
Although once I had two amps and was in the process of selling one, and she mentioned that she liked the tone of the "smaller one" better (which happened to be the one I was keeping). That was awesome

