No offense taken. I was just wondering if vectorization is the best solution. An open question: maybe it is or maybe it isn’t. I mean you could get a similar look by manipulating a raster, unless you are willing to go deeper than simple tracing.
As for color shift, I do see the problem and empathize. However, I am not good with colors. I can see the difference between colors but somehow have trouble identifying them, so I have refrained from commenting on the subject.
If the color shift is regional, you could attempt to place shapes on top of the trace to blend and reach your target color. I have done this in the past when in a bind. There are many online tools that can help find the hexes you need.