Assuming the coil fits, the spider fits, and the cone is the right size, the t/s parameters can be drastically different. For instance if you put a fully loaded BTL recone in a RE SE, it will fit but it won't perform as desired because the soft parts are made for a stronger motor. Usually people that are able to take different parts and build up a different woofer understand how each part affects the others and they are able to compensate to make a workable woofer. It's very easy to build a woofer that is all wrong. It could have an extremely high fs and not have much low end at all. It could have very low fs which usually means high moving mass and not enough motor force to compensate. If you don't know what does what, sending it to PSI will be a good although costly choice.