lets say I have 2 sites, site 1 and site 2. I SEO site 1 and get 100 backlinks from 100 different domains. they are all blog comments, I spend a lot of time manually commenting on 1000 blogs and I find 100 blogs where the admins approve the comment. the other 900 dont approve. at this point, it would be very easy to seo site 2. all I have to do is scrape those 100 blogs for other pages, and comment again. except site 1 and site 2 would have the exact same backlink profile. the exact same domains that link to site 1 link to site 2. is this ok or is it going to raise red flags? what percentage of 2 sites having the same backlinks is ok?