true if the chainId of the connected wallet is different from the chainId of the network passed into 
You can check if a users wallet is connected to the correct chain ID as follows:
import { useNetworkMismatch } from "@thirdweb-dev/react"
const App = () => {
  const isMismatched = useNetworkMismatch()
  return <div>{isMismatched}</div>
}
From here, you can prompt users to switch their network using the useNetwork hook.
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Hook for checking whether the connected wallet is on the correct network specified by the
networkpassed to the<ThirdwebProvider />.