I have several bags (10 I think?) in Gold and several (five?) in Fauve Barenia, and yes, I find them quite similar, so I do not duplicate in the exact same model and size. The tone is similar and the naturel contrast stitch makes them look even more alike. The Barenia will darken a bit more than Gold IF you heavily patinate it, but it's still not that different. I try to keep some variation in my bags, for instance my Gold Togo K28 is retourné and my Barenia Fauve K25 is selllier. All my Gold and Barenia bags are PHW/BPHW, but that is just my personal preference for this color.
If you are in a position to have near-identical bags with different HW to match your jewelry, though, it could make sense.