Indole-3-butyric acid is indole-3-butyric acid -- a rose is a rose by any other name. This is IUPAC nomenclature. You could draw out the molecule atom-for-atom from the name. Just as with perscription drugs, "generics" in this context are atom for atom the exactly same thing, just as effective, just as safe as the branded product -- assuming it was safe to start.
If it's molecularly the same, it has the exact same chemical and phyiscal properties because brand name is irrelevant to such things. There are some different options for 'active ingredient' for a root hormone, so just have to make sure it matches up with same concentration, if you prefer the clonex brand. Doesn't even matter if it was made by different means, IBA is always going to act like IBA in a predictable and consistent way. The universe is deterministic... or else all our modern advancements and technology wouldn't work.
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From clonex:
Clonex Rooting Hormone Gel Composition
HORMONES – Contains IBA (Indole Butyric Acid), a synthetic and stable version of the naturally
occurring hormones, Auxins. Non toxic to plants and instrumental in the initiation and active
promotion of root development.
ANTI-FUNGAL AGENTS– Effectively guard delicate cuttings against fungal and microbial infection and
disease.
VITAMINS– Guard against and minimize the inevitable stress for plants associated with propagation
and transplant shock.
COMPLETE MINERAL PROFILE – Ensures each of the twelve essential macro and micro elements are
available to the plant at the earliest opportunity through newly emerging roots.
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so it's got the IBA hormone equivalent, some nutrients and a couple other things that help sell the product but probably unsupportted by evidence as far as any measurable effect.
limited research supports 'vitamins' and even porcelain has 'antifungal properties' it's a very broad term, but the context of clones has high humidity and higher risks, so anything might help there... relative to your mature plants, probably irrelevant to preventing disease compared to control. The light amount of balanced nutrients you can probably provide more cheaply than this over-priced product. There's no feature of "Clonex" that makes it magically different than generic options.
Even root hormone isn't a huge factor. Save 1/2 a day over doing things competently early on in the context of a rooting clone? There's some evidence but i don't think it's fully certain as to the measurable effect in the first place. Relies a lot on anecdotal accounts, and that's how you end up with people spraying their plants with milk, lol.