Estonia 10 Senti 1991-2008 composition change ?

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Hi all,
I've got the 1992 and 2002 versions.
They don't get the same color.
In the Numista sheet, material is : Aluminium-bronze, yet on another site it's mentioned brass.
Where there a change of material ?
Thanks in advance for your answer
Referee of south atlantic islands
On the website of Eesti Pank the composition for all senti coins is given as Cu93Al5Ni2 which is aluminum bronze as far as I can find. No difference in composition over the years is mentioned.

edit: brass would include zinc
Just call me Bram

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