Hi, the raised panel bits used with the Oak-Park system are made to the same set up as bits by Freud, MLCS, and CMT. If the bit has a 1/2" bearing on the top it is on the same set up. I have used other bit sets with the Oak-Park system with no problem.
However, if you use some one elses stile and rail bits you could have a problem, because the single cutter used to make the with the Oak Park system is made so that which ever one you are cutting has the face down. This was done to eliminate unevenness of thre face side which would reqiire sanding. I believe that Infinity has both cutters on one bit and it references the face side. If you buy a separate stile and rail set with two cutters just be sure that the cutting is being done with the face side to the table. That way you will have fewer poblems. On the tape that I got with the raised panel system Bob goes into the same details about having the face side down. Hope this helps out..Woodnut65