Peter,
Namaste...
There is a good book written by Laurelle Shanti Gaia called, The Book on Karuna Reiki. She ties the two in quite nicely together. I used this book along with Rands for my training.
As far as personal experiences, I'm only recently attuned to Karuna so don't have much to share. I only can say it definately has a different feel to it.
I really gravitate to the symbols as well. I feel them very deeply (for lack of a better word). In comparison to Uusi symbols, I don't use them much anymore. I "just do it". :-)
But that's just me...
...hope this helps in some way.
Abundant blessings,
Mammabear
