Speedlines VS Cup 1 split rim

[loveice]

I've been trying to find out the difference in appearance between Speedlines offered as an option on late 964s and Cup1 split rims offered on Turbo S. It seems the only difference is Speedlines have a concave surface on each spoke. Whereas, Cup 1 split rims have flat surface on each spoke. Is there any other difference? Thanks. Merry Christmas and happy new year.