Part inquiries are not handled here on the forum. For information on parts, simply contact our Parts Department. If you live in the US, you can reach them at 401-658-3131 ext. 1403. If you wish to reach the Parts Department by email, contact them at email@example.com.
In terms of the differences between these two pianos, the Coda has semi-weighted keys, while the Coda Pro has hammer action keys. For more information on these different types of weighted keys, check out this page here.