The question is in the title. According to everymac.com the dimensions of the cases are the same.
I read that my 2012 MBA is 16:10? The resolution is 1440x900 and I've had other macs with the same Resolutions (2006/7 MBP, iMac G5 17"). I would have never thought of the iMac or the MBA being 16:10
Yep, the MBA is 16:10. iMacs past 2009 are 16:9.