Check out Drain Fixture Units (DFU). This will answer your question. You have to measure the inside diameter of the drain pipe, easy to do if you measure the circumference of the pipe and post that information here.
The bigger question, after you get your "Yes" answer, is how you will bring sufficient venting to the drains. More drains, more vents needed, to prevent having one draining fixture suck water out of the adjacent P traps and therby allow sewer gases to come back up the drain and into the house.