How to use DIC spot color

I would submit if you've specified any color build in your document as "spot color" that it really doesn't matter which process color model you use to define it. Because if you're printing with spot color, some printer somewhere is going to load one color ink into the press and print whatever color that ink is onto your paper or other substrate. It's going to be that color ink applied on press, or it's not. And it's pot luck whether you're going to get a perfect match in your process color model no matter what process color model you use.

If you want to get the perfect spot color on press, you need to specify your spot color using a spot color model. Whether it's PANTONE, DIC, ANPAcolor or TRUMATCH, pick the color you want from a spot color model if you want to ensure you're getting the color you want. And if you want to be sure of those results pick it from something printed on paper/substrate like you want to use, rather than expect something you see onscreen with InDesign to look like what you'll get on press.

Pick the color from a printed color book if you expect the printer to give you the color you want. If you're picking spot color onscreen you're chasing an apparition.

Now that I'm done ranting, please let me climb down from my soap box and answer your question directly. Which process color model you use to define your DIC color build doesn't matter, and I wouldn't bother. Because spot color is spot color.