AFAIK the letter A corresponds to Taiwan. No letter, Japan. So IF30 = IF30A in terms of electrical characteristics.
I'm in a similar case, I have a suitcase but no adapter, I was thinking about using a Megadrive adapter BUT it doesn't reach the 1450ma, so not possible.
You must use a 9V output, or 12V, but at least it must give 1450ma. Center positive, same plug size.
As for using original vs new equipment, I'll be using (when I find one) the original one instead those new switching adapters.