VS95 Aircraft Swap

Hi
I've noticed that the VS95 LHR-YVR rotation has been operated by a 333 in place of the usual 343 these past few days. Any particular reason for the aircraft switch? Were these flights scheduled as a 333 or was it a last minute switch ? Anyone think this might be a more permanent change to this flight? Just wondering as I'll be taking this flight in August and would sort of like to get the newer A333 instead of the ancient 343.
Any info would be much appreciated.
Thanks
I've noticed that the VS95 LHR-YVR rotation has been operated by a 333 in place of the usual 343 these past few days. Any particular reason for the aircraft switch? Were these flights scheduled as a 333 or was it a last minute switch ? Anyone think this might be a more permanent change to this flight? Just wondering as I'll be taking this flight in August and would sort of like to get the newer A333 instead of the ancient 343.
Any info would be much appreciated.
Thanks