You get an endorsement on a C310 and i think you still get 340 also but it doesnt mean you can fly it
I thought it was the other way around.... You get a C340 endo and it covers you for the C310
I thought these days if you were endorsed on an a/c that was pressurized then you did not require a pressurization rating. In the same vane that you no longer require a BGT course before flying turbines.