The DGX505 only has an A & B variation. From Yamaha web site for DGX505, "Intro, Main A/B, Ending, Fill-in x 2". I don't believe you can load a PSR3000 style without conversion to A & B only. Specs on the PSR3000, "Accompaniment On/Off, OTS Link, Auto Fill in, Intro x 3, Fill In x 4, Break x 1, Main Sections x 4, Ending x 3, Fade In/Out, Tap Tempo, Sync Start, Sync Stop, Ritardando"
You would need to create 2 styles from the one PSR3000 style using "Style Fix"
Starkeeper
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I play Roland EM20 and Yamaha PSR550