copy paste from https://moz.com/community/q/negative-seo-impact-of-two-similar-domains-on-same-ipThe server or IP address has little to no effect on SEO. Your biggest concern is having a server that is close to your audience in terms of geographic location, that it is fast, and that you are not encumbered by the traffic to any other sites sharing the same IP.
Yes, you can share your same IP for two sites. But my suggestion is host USA blog in USA ip for better rankings.