IAD to LHR - A330 or A340?

The website tells me VS22 is being operated by the A340-300 on one screen and then when I click through to the payment screen it says A330.

I know the A330 usually operates this route but I'm worried they are switching in the A340 for my flight on 12 August.

Anybody know the schedule? Many thanks!

[buns]

Expertflyer currently showing the service will be operated by an A330 on August 12

buns