I've found, in my experience, that the Color Bridge conversions are more accurate, compared to any app. We did a bunch of tests on our Epsons, and even the Color Bridge colors needed some tweaking, depending on the substrate. There's a lot of variance, even when you look in the Color Bridge swatch books.
We created color palettes, in InDesign, with our custom brand palettes. About 70 percent of our design files ultimately end up in InDesign. In theory, we can just have anyone working for that brand load the palette, and work in those colors.
If you're picked a printer for this particular job, they may be willing to run some pres tests. We've run a number of 6 and 8 color press tests, to compare PMS/CMYK variations on specific paper stocks. I have seen brand swatch books, for companies, that have their colors printed, in CMYK and PMS, on their brand stocks. Sometimes instead of CMYK values, they have LAB values printed in the book. It seems like a lot of work, but in the long run, it saves a lot of headache.
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