Training in yards, racing in meters?

Hi all, My names Matt, 34 year old from Vancouver BC. I raced/trained from 7 to 17 years old, then burnt out and quit swimming. Took up mountain biking (and proceeded to wreck my shoulders wiping out with poor form -never did learn the tuck and roll) and have been doing that since. About a year ago, I restarted swimming as an alternate to the gym, and because the trails were snowed in. Now Im thinking about racing again, and may do so soon (my goal is to go under 2:00 in 200 free SCM). My question is this: I have lots of pool time (UBC aquatic centre), but I most often wind up in the 25 yard diving tank for my workouts as the 25m lanes are usually an absolute gong show. If I want to race in meters, should I make every effort to train meters, or is yards OK? Is there a disadvantage going from yards to meters? Thanks! Matt P.S. I gotta say, this is a great board. Lots of great workouts, advice, good attitudes. Thanks again.