The 3224 is the cousin of the 1224/1232.
The 3260 is an "all new" engine (sort of) built on the frame of the 2051. It has hints of the 2232 series machine stuffed inside a 2051. The ADF is new for this model.
The 3228/35/45 is the cousin to the 2228/32/38.
Happy Selling!