Does It Matter?....
 

does it matter if I use a s1 instead of a s2 for a sb hybrid?

dont think so

Yes, it does matter. The armatures have different numbers of turns. The S2 will give more speed, the S1 will give more torque. Since you are adding SB magnets to increase torque, there is no point in using the high torque S1 armature. Use a S2 for best results.