m0useanswered grow question a year ago If you scrolled down on the brands page I posted this on their wall as I was also confused.
The original General Hydroponics company was bought out by Scotts Miracle-Gro in 2015, Terra Aquatica is the independent offshoot that formed after that merger.
https://www.hydroexperts.com.au/Why-a-new-brand
If anything stop buying GHE branded products as they are not the same ownership anymore and switch over to TA branded products.
Or don't, I did not see any altering on the composition of any of the fertilizers but thats not saying it can't happen down the line, who knows its Scotts Miracle-Gro.