Installing a sewage pump

[Kamisdad]

I have a fairly new home, built in 2004, that has the drains roughed into the floor leading to a basin in which I am installing a sewage pump. The contractor originally had a strandard sump pump in this basin to extract the water generated by my furnace. I also have a second basin next to this one that is for my footer drains. The problem that I have run into is such: the standard sump was connected using a 1-1/2" pipe and the sewage, of course uses a 2" pipe. At the connection going into the main drain is 1-1/2". First -- Can I adapt the 2" pipe to the 1-1/2" at this connection, or will it be required to be 2" all the way to the main line? Second -- Can I connect the sewage pump and the sump in the footer together using a "Y" connection? Any assistance or advice would be great.