Hello Linos
Yes, your T2 styles will work in your SX900 keyboard but so will T3, T4 and T5 styles work in your keyboard.
So, instead of you using your old T2 styles, you ought to get and use all the T5 styles FIRST. T5 styles will use the better sounding Voices that you have in your SX900 keyboard.
You can get the T5 styles from this page:
https://www.psrtutorial.com/sty/yamaha/Tyros5/tyros_5.htmlThen you click on the DARK BLUE category labels to download each of the 10 categories to a USB stick.
BALLAD - 57 Styles
COUNTRY - 35 Styles
DANCE - 50 Styles
ENTERTAINER - 50 Styles
LATIN - 45 Styles
MOVIE&SHOW - 48 Styles
POP&ROCK - 70 Styles
R&B - 53 Styles
SWING&JAZZ - 50 Styles
WORLD - 52 Styles
If you see a style listed not on the T5 in an older keyboard (T2,T3,T4) just click on that keyboard’s page and get those styles too.
https://www.psrtutorial.com/sty/yamaha/index.htmlRegards
Drake