gbuyer, does not look like they are compatible. The iMac (24-inch Early 2008) uses either a MXM III, M76XT+/256MB GDDR3 part number 661-4663 or a MXM III, G92GT+/512MB GDDR3 (CTO) part number 661-4664. The compatibility for those cards is with":
iMac 24" 2.8GHz Core 2 Duo (A1225) - Mid 2008
iMac 24" 3.06GHz Core 2 Duo (A1225) - Mid 2008
only.
Now for the one you are looking at, the Video Card for the mid 2007 20" model is either part number 661-4436. Compatibility is:
iMac 20" 2.0GHz Core 2 Duo (A1224) - Mid 2007
iMac 20" 2.4GHz Core 2 Duo (A1224) - Mid 2007
iMac 20" 2.4GHz Core 2 Duo (A1224) - Mid 2008
iMac 20" 2.66GHz Core 2 Duo (A1224) - Mid 2008
or it uses part number 661-4440, which is compatible with :
iMac 20" 2.0GHz Core 2 Duo (A1224) - Mid 2007
iMac 20" 2.4GHz Core 2 Duo (A1224) - Mid 2007
iMac 20" 2.4GHz Core 2 Duo (A1224) - Mid 2008
iMac 20" 2.66GHz Core 2 Duo (A1224) - Mid 2008
Hope this helps, good luck.
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