No. System Center is designed to manage at a datacenter scale, while Windows Admin Center is providing deep management access to a single server or clusters. In small environments you could use Windows Admin Center only, but in larger datacenter deployments, a combination of both will be most likely.
|System Center: Datacenter-scale management and monitoring||Windows Admin Center: Individual server or small cluster management|
|Extensible and scalable monitoring platform in System Center Operations Manager||Browser based, remote management for configuration, maintenance and troubleshooting|
|Deploying and managing Hyper-V, Windows Server clusters at datacenter scale||Lightweight, single server and single cluster management|
|Alerts, notifications, third-party workloads monitoring||Cloud-ready and hybrid Azure integration capabilities|
|Integration with System Center Service Manager and other tools||Cloud-ready and hybrid Azure integration capabilities|
|System Center Data Protection Manager|
|System Center Service Manager|
Server Management Licenses are needed for managed devices that run server operating system environments (OSEs). These server MLs will be core based. To license the OSEs under management, all physical cores in the server being managed must be licensed. A minimum of 8 core licenses is required for each physical processor in the server and at least 16 core licenses for each server.
How to license System Center 2019 server management licenses by physical cores
|Physical cores per processor|
|Processors per Server||2||4||6||8||10|
|4 *||16||16||16||16||20 **|
* Standard edition may need additional licenses
** Additional licenses required