iMac 2010 support LGA 1156 CPU
But iMac 2011 Support LGA 1155 CPU
Both GPU is MXM card but card rate is different
iMac 2010 support HD 4670m and 5670 M
But 2011 is different.
Ram is the same but capacity is different
You can install 16GB on 2010
But 32 GB on 2011
Place of scroll is also different
2010 USB port and display port and FireWire port is different to 2011
LCD data cable is also different
On 2010 iMac you can install core i 7 860s
But 2011 is different
You can install windows 10,11 in both model
Firmware bios SMC is also different
Power Frequency is also different