No. While proxy servers and VPNs can both help you access content you might normally not have access to, there are crucial differences between the two services.
First of all, while a VPN encrypts your internet connection to hide your online antics from being observed, a proxy server does not encrypt your connection, meaning your online travels can still be tracked and observed. VPNs also offer other protective measures, helping you avoid online hazards, and not tracking your online activities. Some proxy servers, especially free proxy services, may track your online travels, selling the information to interested outsiders.