the feeling i've gotten on the interview trail is "no." i think most programs expect you to come knowing little to nothing about anesthesia, either intellectually or technically. at almost all of the programs i interviewed at, the first 1-2 months are spent in basically a crash course teaching you the basics of anesthesia with daily lectures and 1:1 or 2:1 resident:attending ratios in the OR.
of course, if you already know how to do some things, it's your chance to shine. but unless you finished your intern year rotating in anesthesia, you're likely to be a little rusty on intubating, starting lines, and all that.