Do objects of different size but same mass have same technical velocity? why?

1. It depends on the condition you are referring to
I mean if you drop a sphere and a thin copper plate both of same mass from the Mt Everest. both will have different velocity and time period to fall on the ground because both of them experiences a drag force upwards due to their shape the more the area you have the more the drag Force if thus the lesser the speed and more the time period is
2. if you assume it to be total vaccum then both of them will fall on the same time and with same velocity no matter the mass is different or the shape is ! physics work same for them ..