Thanks Sham.

Thanks Justin, can you give me an idea of how complex the customization would be ?  Also, where are the version details of pages stored ? (I couldn't find it in crx repository : http://<host:port>/crx/explorer/  , I was assuming it should be here /content/<page>/jcr:content ). 

I have a requirement in my project where we need to make the older versions of a page available to viewers in publish instance. I know we can easily check older versions of a page in author instance and also compare the differences in two versions. Is it possible to have something similar in Publish...