Unless EY have very unique towbars (which I don't believe they woud have because it's not cost effective), then the normal A346 towbar is also used for the A345 as standard.It's a heavy weight towbar compared to others.
An A330/A343 towbar cannot be used for either aircraft due to the weight differential and the shear pin loading.
Are you sure that an A343 towbar was not loaded in error?