Joe,
Are these one and the same Korkers?

Nope....
I don't know too much about their new products - I got to bone up on them...I am going to carry the K1100+
Don't get too fancy with what you use....

Its my understanding that the 1100s are now called the "Jetty Plus" and the 5000s are the "X-Stream".Same product with a new name.

http://korkers.com/product.php?recKey=21

I don't know - looks like it's still called the 5000 - K5000, K1100 - The K1100+ is a good product.
Their product line is mature so they are trying to grow sales by introducing more specialized products...

Love my 1100+ - simple, more studs and light