Can I do accuracy assessment using a classification image in different year as a refe

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I have done LC classifications using MODIS images (250 m spatial resolution) in 2000, 2003, 2006 and 2009. Coverage area is quite big (col and row are more than 15000 and 6000 respectively). Now I wanna do accuracy assessment. But I obtained a classification image in 2008 as a reference image. Can I use this image to evaluate performance of classification results of 4 classification images? Should I use the images obtained in same years with classification images? Or is there any other way to do accuracy assessment?
Thank you all



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