Very.
Rose Shocking has a yellow undertone, fuschia had more of a blue undertone (depending on the leather, of course). Also, fuschia isn't in production, currently, in favour of RS. That's not to say it isn't available, but was 'phased out' for the intro of RS.
Personally, I prefer RS.
Here you go, courtesy of orchids.
Another comparison for you. RS is on the left in this side by side pic