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DP works by darkening the red hairs on a horse. This means that black/grullo horses won't have much change to them, if any. Bays can have dp, but depending on the bay gene depends on how the horses look. Usually for normal bay and I think brown, the belly gets a darker/richer mahogany colour. For wild bay, they become brighter, kind of like ketchup. Neither of those horses have dp.

All of the DP RS are these:
Hom dp: Freaky Friday (hom sooty, hom frame) and Cherry Drop (no sooty, wild bay)
Het dp: Rhythm of Four (buckskin), Kings Ransom (Champagne), Dark Chocolate (Chocolate Palomino)

@kintara and ObsidianKitsune thank you so much! I’ve been so befuddled about the whole thing. @ObsidianKitsune thanks a million for the links! I’m going to check them out right now :)

Good question: Any horse can have DP. DP is a proposed darkening gene (well, it's the game's version) that livers and chocolate palominos need to exist, because with only regular sooty alleles they'll only be dark chestnuts or palominos. With other base coats and genes, the DP doesn't make as stark a difference, so no name came up for those shades in real life. Cherry Drops do get DP with their set of genes because that's hat Ammit decided to do. I think they get two copies of it.
The horses you have there are likely both DPless. :/ The first one definitely doesn't. Wild Bay acts differently from the others (the Bay allele with the + sign afterwards) and gets that dark naturally. It's also dominant over regular Bay and Brown, so any time you have a + in your Agouti alleles (and a dominant E) you'll have a Wild Bay base instead of a Brown or regular Bay.
The second horse is a Brown, which is a less strong version of Agouti and is written as 'At'. They are naturally darker than regular bay as well, and because she has both sooty alleles she is pretty darn dark on her own. I forget how dark a brown gets with DP, but I used to breed them all the time. :P The ones I have now almost always have a fantasy gene covering the base coat color.