Debatable. The 867Mhz and 1Ghz models have 256k of on-die cache plus 1MB of additional "level 3" cache on the motherboard, while Aluminum models use a CPU with 512K of on-die. Which layout (bigger+slower vs. faster+smaller) would be quicker depends a *lot* on what application you're running.
My guess would be that marginally faster system bus and improved chipset in the AL models would probably leave them with the edge over an overclocked-to-the-same-rate Ti, but there might be *something* the older system does better. All I know is when I swapped a 1.33gz Al for an 867Mhz Ti as my personal machine it felt like no contest, the Al ran rings around the Ti, but... that perception could simply be due to the fact that at that time an 867Mhz G4 had reached the point where it was objectively too slow to do certain things (like play certain video formats) while a 1.33Ghz box could still pull it off. Both are of course about equally "too slow" today.