You are right, it is the same thing. I sent ADI an email to ask about it a while ago and they replied with the following:
“Thank you for your enquiry with regard to reloading using ADI Sporting
powders.
ADI Powders are distributed exclusively in North America by the Hodgdon Powder
Company. Please find attached a list of the ADI Powders which the Hodgdon Powder
Company do distribute and the tradenames under which they are marketed.
As you can see AR2209 and H4350 are identical.
Extreme caution should be taken and loads should be worked up accordingly. Refer to
our website at www.adi-powders.com.au or our 9th edition handloaders’ guide for more
information, warnings and reloading safety.
We thank you for using ADI Sporting Powders.
Yours sincerely,
ADI Technical Centre”
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