Have that ever happened before? That a sequel sells more in the first week than what the predecessor has sold LTD.
Resident Evil, if you ignore the Saturn and Director's Cut editions:
[PS1] Resident Evil (Capcom) {1996-03-22} - 148,904 /
1,194,779
[SAT] Resident Evil (Capcom) {1997-07-25} - 68,130 / 148,369
[PS1] Resident Evil: Director's Cut (Capcom) {1997-09-25} - 144,349 / 514,122
[PS1] Resident Evil 2 (Capcom) {1998-01-29} -
1,389,733 / 2,154,975
Yu-Gi-Oh IV after III, although its first week didn't best the original LTD:
[NGB] Yu-Gi-Oh! Duel Monsters (Konami) {1998-12-17} - 683,948 /
1,522,971
[NGB] Yu-Gi-Oh! Duel Monsters II (Konami) {1999-07-08} - 401,533 / 984,862
[NGB] Yu-Gi-Oh! Duel Monsters III (Konami) {2000-07-13} - 327,686 /
726,519
[NGB] Yu-Gi-Oh! Duel Monsters IV (Konami) {2000-12-07} -
1,228,599 / 2,210,163
Monster Hunter Portable if you ignore the Best release:
[PSP] Monster Hunter Freedom (Capcom) {2005-12-01} - 118,317 /
668,964
[PSP] Monster Hunter Freedom [PSP the Best] (Capcom) {2006-08-03} - 12,314 / 290,904
[PSP] Monster Hunter Freedom 2 (Capcom) {2007-02-22} -
746,313 / 1,723,187
There are others that fit the criteria, but with smaller sales (100k, 50k) which I suppose makes it easier to happen. Nothing on the 1 million level (from what I can see since 1996, according to Famitsu)