[Brightcolours]

Why would it matter if you shoot raw?
You can do whatever you please with the colors...

I always shoot RAW, I tried several times,my experience confirms what BC said: impossible to get exactly the same colors from different cameras.

You can get very close, actually, with the aid of soem tools, like these:
https://www.xrite.com/categories/calibra...rt-photo-2

HTH, kind regards, Wim

That is not a usable solution. It is fine when you want to set a custom WB or something, but you don't want a colorchecker in every image you shoot outdoors, or next to your macro bug subject, do you? Nor will such a colorchecker give you the look you might love from a certain specific camera (Like Toni's 5D) or certain RAW converter (like my DPP).

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Using CLUT (color lookup tables) (http://www.quelsolaar.com/technology/clut.html) and tonal curves, it would be possible to get pretty much the same output on various cameras.
However, it would indeed require patience.
In RawTherapee for instance you can use your own CLUT.

And how would you go about creating that "5D clut" and tonal curves to use with your lets say Fuji X-T3?