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I am not an engineer, or mechanic, so take what I say with a grain of salt. From what I read, the original 1MZ was non-interference, such as the engine on the 98-00 Sienna. But, when Toyota added variable valve timing to the 1MZ, or VVT-i (i.e. 01-03 Sienna), it would become interference IF the timing belt snapped while VVT-i was activated. I believe it would only be activated at high RPMs. So, if you have a 1MZ w/VVT-i, and your timing belt snapped while you were idling, you should be OK, whereas if it snapped while you were doing 85mph, you would not. I read that it was a similar situation for the 3MZ, where the engine was interference only at higher RPMs.
I don't want to spread wrong information, so someone please correct me if I'm wrong. But I remember reading this somewhere and drawing the conclusion that I did. I could be completely off though.
But yes, change the timing belt. Whether it's interference or non-interference, it will leave you stranded when it snaps. Change the water pump too.
2001 Camry LE 2.2L, Black, 146K as of 7/19
Bought 10/16 with 131K
2001 Camry LE 2.2L, Lunar Mist Metallic, 97K as of 7/19
Bought 6/01 brand new