Everything is contributing to the tone. The Teisco may or may not have the same scale length. It has 40+ year old wood and a different bridge. The pickup(s) are likely in a different spot than on the strat and the pickups are going to be different sounding than the strat pickups. I can't say how the pickups sound compared to the squier pickups because there were probably eight different kinds of pickups that came on old teiscos, all of which sound different. You got a pic?