AU Auto transmition fluid

[Faded_Mantis]

I often hear people say not to use DEX-III auto trans fluid in the Falcon 4 speed auto.

But I have some Texamatic 1888 spare incase I needed it for me old car which says "Dex-III H spec" on it, but below this it says "Ford Mecron M[numbers here]"

Does this mean that it can be used on my AU's 4speed auto or do I need to get one of those other ones that people always talk about?