how to transfer the style files...

hi.
i once had a psr 2000 so i still
have the style files in my floppy Disk
but i tried to load it to my
yamaha psr 550 and it can be loaded but
it CAN'T play the styles that i was looking
for.. Ok, as you already know that
the yamaha psr 2000 has 4 "fill in buttons" right?
yea..anyways, the styles that im looking for
is inside the "fill in C and D" but my psr
550 have only "fill in A and B"..so how am
i gonna play those beats that i made using
my psr 2000?? IS THERE A WAY I CAN
TRANSFER THOSE BEATS FROM "FILL IN C AND D"
TO THE "FILL IN A AND B" OF MY PSR 550??

Thank you from Oregon State=]