My advice to you... if you can't tell the difference, then it's not worth it.
I'll also say, if you can play... I mean really play, then it doesn't matter. Marcus Miller & many of the people here would make an Indonesian Affinity sound better than I could make a Fedora sound. If your bass is less than 5 years old, it's not holding you back from developing your technique, or expressing yourself.
IMO, based on my experience, you as the player will be the only one who could tell the difference. Your audience won't hear it, your soundman won't hear it. It's just something you'll feel. Physically, emotionally, & inspirationally. That's not to say there isn't a real, qualitative difference. There is. They use better hardware in the more expensive models regardless the country of origin. But the sonic difference between chrome & nickel are subtle. Same with AA grade wood vs AAA. Get all the right pieces together & the instrument will feel alive. Where you're not so much playing it, but communicating with it.