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That, unfortunately, happens quite a bit. An aftermarket headunit getting poorer AM reception than the OEM headunit. Options are to replace the headunit with one more sensitive, or use an aftermarket antenna, especially amplified ones (separate amp for AM and FM).
Exact same thing happened when I swapped the OEM Toyota (Fujitsu-10) for a Kenwood - AM reception was close to zero. Replaced it with a Sony and Alpine later - both were better, but not as good as the OEM. Eventually going to replace the pillar mounted antenna with an amplified "low profile puck" version - but haven't gotten around to it.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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