I don't think the flybacks for the Classic and the SE series are compatible. The classic flyback has more pins (10 + 1) than the SE analog board (8 + 1).

Also, I don't think the flybacks for 128k/512k/Plus are forward compatible (at least physically due to a smaller pin layout) for an SE analog board. However the 128k analog board has provisions for a larger (presumably SE) flyback in the board layout. Here is a photo of JDW's 128K analog board: