Can't use the same drillings. The Time Zone has an asymmetric core while the Silver Streak Pearl is a symmetric. If you use "equivalent reaction" drillings, the TZ will have the capability to handle slightly more oil because it's solid pK 18, while the SSP is strong but pearlized. The TZ's core can make it emulate the ball path of the SSP, if you wanted that, because of its asymmetric core and with polish.  In general, though, both have been used to handle medium-light to medium oil patterns.