Cypress Hills has a much different feel than East New York, even many years ago. They're only physically close.
My last Brooklyn digs were on E.13th Street, between between S and T. The neighborhood actually had a proper, non-BS name, "Homecrest"--a block away was Homecrest Avenue. But I always said "Sheepshead Bay," because that clicked in people's minds, but by me Sheepshead Bay doesn't really start until south of Neck Rd.
OT--Until the Brighton Line was put in the cut c.1907, Newkirk Avenue station was called "South Midwood," but in my growing up years in Flatbush this wuldn't have been NORTH of Midwood proper, and in the southern part of what we'd call Flatbush. I suppose the "South" part of the station possibly dates from the old Dutch in which Flatbush and Midwood were more or less the same area.