How similar is Silver Sentry to the real Superman?

[sdp]

I'd like to think that artist are inspired by the heroes they see but the stories are completely made up. So any origin or whatever are just ideas the in univers authors came up with to explain how SS got his powers not necessarily true. They might have seen Turtle Titan save someone but they wouldn't know his true identity is Mikey and he's a mutated turtle for example even i they did write an issue for Titanic Tales explaining his origin.