Short answer: No, not entirely. Your sleep cycle might match the origin, but the environment around you won't. You've had years of getting used to the daily cycle, breakfast, lunch, dinner, darkness falls, and you sleep.
The key thing here is the darkness/light cycle. Your body is used to having the sunlight mean 'time to get up' and the pineal gland stops secreting melatonin to help with this. You trying to stay on your old time is all fine in your head as an ideal, but nobody told your pineal gland, and when that light comes, the melatonin production will slow, and indeed at night, will start.
As a result, you could take melatonin tablets when you want to go to sleep and see if that helps, but you're going to be fighting against your body's natural processes the whole time.
The usually quoted guide is it takes 1 day per hour of timezone difference to adjust to the new timezone (experience may vary), so if you're going for more than a week, it's probably going to be easier to try and adjust.