TWO websites are falling Under Same Class C IP Address, owned by One Person, promoting the website according to Google Webmaster Guidelines (On Page and Off page) and doing the promotional activities for Same SET of keywords. (With complete Unique Content and Unique Design)
Question is: For Ex: Both websites received 50 Same external Listings (Qualitative), Google will count / pass the value to BOTH websites from ALL 50 Sites OR Only to First Listing / One Listing? Please clarify?
Or Google will consider it as Negative? Like One Website Owner TRYING to occupy TWO positions in TOP 10? Please educate us.
If we change the Second website Ownership, registration address, IP address, Branding and etc..will it be a good idea?
I would say that there is a good chance that Google would view this as a doorway.
I have seen this with a lot of the micro niche sites. They used to occupy many listings in the top 10 with multiple sites and then got slammed with the doorway page notification through webmaster tools. I would be cautious of doing this.
If you are looking at this as a shortcut or a trick then you are probably not going to do this right. If you look at this as market expansion and promoting your brand then you are probably going to do ok.
Sometimes I launch multiple sites going after the same industry and same keyword. I make sure each site offers unique value and has a clear purpose.
For example one site can be an e-commerce site with consumer reviews and how-to guides. Another site can be more news/blog oriented. I would not replicate the backlink profile 100% for the sites. Sure some backlinks will be duplicated and point to both of my sites. But I will leverage the unique value of each site to open the door at as many valuable websites as possible. For example bloggers tend to be more inclined to link to a blog than an e-commerce site. Product review sites tend to link to e-commerce sites more than news websites. This will ensure that each of my sites have a unique backlink profile and create a synergy between my branded sites.
As goodroi says, it can be done, but it's kind of tricky. I have a client who has three websites in the same industry and there is some overlap on search terms. On one he sells consumer products. On another, he sells training and certifies people for servicing, and a third is an industry blog. Things shift around a lot in the SERPs, but the content and focus of the sites is different enough between them that they all do pretty well.