The tricky part is that I live in an apartment complex where the internet is provided for us, so I do not interact directly with the ISP. However, I believe the provider is Charter.
No, the IP is not the same on both routers. I'm not sure what the older router's IP is, but it's not the same as the new one's, which is 192.168.0.155.
I have the WAN set to DHCP on both routers, but the new one is not working.