flyback transformers vary from model to model on most TVs. the bigger the tube, the higher the voltage required for the anode, and the more current required for the deflection yoke. focus element voltages and screen grid voltages also vary with tube size, and since these controls are built-in to most flybacks, a different voltage division ratio might be used internally. i'm not saying it won't work, what i'm saying is it might not work well. what you may find is that it works, but the picture is distorted horizontally,squished or stretched on one side or stretched in the middle and squished on both sides. the fact that yokes are glued to the tube is another possible source of trouble. the yoke from one tube might not be well matched to the primary inductance of a different flyback. it's the inductance of the yoke, along with other wave shaping components that take a rectangular pulse from the output transistor and flyback and turn it into a linear ramp of current through the yoke. the distorted pictures i described above are indications that the ramped current isn't linear. if you were to try swapping the old yoke on to the new tube, be prepared for several hours of convergence alignments. when i was repairing computer monitors i got the process down to a couple of hours. i can tell you it takes practice and preparation to get it right.