Yes you can convert them.The 910 uses SFF2 format you need SFF1 format styles. The link will take you Jorgen Sorenson's site where you will find free "Style format 2 converter" You will also find a write-up on styles as well and many other programs. There are also free programs on this web site which are very good for tuning when you are finished converting and some courses as well.http://www.jososoft.dk/yamaha/
Here is the main site for this forum utilities link.http://www.psrtutorial.com/util/index.html
If you have difficulty don't hesitate to ask.