Yes, Amazon allows different sites to use the same IP address. Although Amazon monitors IP addresses to ensure security and compliance, they also understand that in some cases multiple sites share the same IP address, such as using the same network environment within a company.

As long as the activities of these sites are legal and comply with Amazon's policies and regulations, using the same IP address will not cause problems. However, you must be careful to avoid improper activities that may be considered violations by Amazon.