Hi Audrey,
I´m quite sure that (style) conversion from T3 to PSR9000 won´t work.
The T3 uses S.Art and S.Art2 voices as well as Megavoices that are all unknown to PSR9000. Styles parts of the T3 / 900 are 4, the 9000 has sometimes only 2.
The styles are completely different in their structure.
As far as I remember the PSR9000 styles consist of 2 parts ( 2 files ), but the T3 have only one file for each style.
As written above from 900 to T3 could work ( but not sound very well, you sure have to adjust at least the volumes of the parts )
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Greetings from East-Frisia ( Northern-Germany )
Korg PA5X Musikant, Fw. 1.4