EZ solution here. NO PLUGINS

1. Map your OBJECT1 with MAP1
2. Open another instance of SU
3. Copy & paste your OBJECT1 to SU2 (It is mapped correctly)
4. Replace MAP1 with MAP2 (only texture) in SU1
5. Copy & paste your OBJECT1 From SU1 to SU2
6. BAM! You have OBJECT2 in SU2 with MAP2

You might want to rename your materials after all.