Hope you don't mind if I post what I found here, re: Jacks.
There are two different websites, jrpeters.com, and jacksnutrients.com, the second being the new(er) one.
Here's an article from a link at jacksnutrients.com that kinda explains this "new line", "Jack's Nutrients". The last three paragraphs.
https://www.cannabizjournal.com/cannabiz-journal-october-2017/2017/10/2/jr-peters-launches-exclusive-cannabis-nutrition-line-jacks-nutrients
On the jacknutrients.com homepage, scroll down past the cannabis image, the link to above article, to the bottom; you can see the "new line" of products (Jack's Nutrients line). On the right is the 5-12-26 (Part A) and the 15-0-0 (Part B, Cal-Nit). On the left, looks like some of those at least are "new formulations"; 7-15-30 sounds pretty similar to 5-12-26.
(Edit: Durp. Didn't see the 7-15-30 in your calculator there).
What my main question is, is has the actual 5-12-26 (Part A) formula/ratios/etc. changed at all? Some of the things I read make it sound like they have changed it a little (or "improved" it a little or something?).
At the jrpeters.com homepage, it now has four "categories"; "Controlled Environment" used to be the one that contained "Jacks Hydroponic 5-12-26" if I remember right. But now, if you go to "Controlled Environment" there's a blurb and a "link" (click the image) and you're taken to "jacksnutrients.com", lol. The "Jack's Professional" category has about sixty different products - all of them in the "old"(?) Jacks/JR Peters packaging - yet not one of them is the 5-12-26... Weird.
The only way I could find "5-12-26" on the jrpeters.com website was to use the search function. Top result (note, it's in new jacks nutrients line packaging):
https://www.jrpeters.com/product_/t31652/t19712-5-12-26-hydroponic---part-a
I couldn't find any pictures of the old package label % numbers that weren't blurry to compare with new packaging, hah.
Haven't looked at the charts yet.
That's what I'd have thought. It would be odd to have two "5-12-26" formulas with just slightly different micro ratio or something, from a companies viewpoint, wouldn't it? But "stores"/resellers of it should run out of the "older packaging" at some point...
"Jacks V2 - CannaSpec" is what they shoulda called this, make it real clear. Lol.