Resin Comparison Doll Family H and Mystic Kids and...?

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So, here's the problem. I have a hodge-podge of this, that, and the other. I'll throw some dolls together and take some pics, but I may not have what you're looking for.

 

Here's a collection of white resin I have:

Doll-Family H and Myou are more yellow-toned.
Dream Valley is lightly yellow and a little gray.
Little Monica and Soul Doll have a pink undertone.
Impldoll, Dollmore, Doll Chateau, Luts, and Iplehouse whites (in 2023, anyways) are more of a "paper" white - as in white like paper.

And here's the reason why I am literally the worst person to ask about this.
Tl;dr - exact resin matching is impossible, unless you plan to ship the part to be matched to a company that offers resin matching as a service (that you must pay for).

Exhibit A: Myou BoHe 45 cm head (white resin, late 2023) on Myou 44 cm female body, version 3 (also white resin, early 2023):

Both ordered from ACBJD. Both head and body made by Myou in 2023. Head is cool, bluish white. Body is warm, yellowish white.
That's just how resin be. Sometimes, one of the colors mixed into the resin decides to pull a Madonna and express itself.

 

Basically - BJDs are made from 2-part epoxy resin. If you search for images of 2-part epoxy resin, you'll see two jugs of clear liquid.
All BJDs have color powder added to them to make them a specific color. Companies use "recipes" (generally based on weight or mass) that they mix into resin to get a relatively consistent color across their lines - but sometimes, resin decides to be a finicky little bastard and cure in a slightly different shade. Or in BoHe's case, the yellow decided today was The Day To Shine! on the body, and blue decided today was Blue Day! for the head.
Resin is not terribly stable - within a year or two, the color starts to change due to exposure to sunlight and plain old air. It's a normal process. Within 5 to 10 years, you're going to have a doll that is a different shade of the color it used to be.
There's a reason why resin is called "poor man's plastic" - it does not have the stability or durability of, say, a Barbie doll. It is much harder to maintain consistency of color in a resin BJD than it is a Barbie.
So if you get an exact match - congratulations! But don't expect it. I always caution anyone considering hybriding to plan to do a little color matching. The head is easier, but if you get a professional face-up, a light dusting of powder on the body will match things up nicely.