The rail is exactly the same. The tie strips may be different. If the tie strip is screwed to the rails, you need to remove the screws. Also, the litle plastic web that connects the ties to each other may need to be cut every 2 or 3 ties (depending on how tight the curve is) so the tie strips can curve. If you have the kind of railbender that only does one rail at a time you'll be taking the tie strips off anyway. But some folks who have the kind of railbender that will do two rails at a time fail to notice (at first) that the tie strips are fastened to the rails or that they have no "give," because they're molded in a straight line.
Best of luck, Dennis, keep us posted. Before, during, and after photos would be especially nice - Paul