They are said to be the same. The Chico Ale yeast is Wyeast-1056, WLP-001, and US-05 (used to be US-56, but I think they were asked to change that ).
A friend who makes excellent beer did a test where the wort was split in 3 fermenters, and each was fermented with one of the above. They were all similar, but there was subtle differences in the beers. US-05 was slightly drier, and maybe with a little tartness in the background. 1056 and 001 were closer in flavor, and I can't remember the differences now.