Hey,
it is possible that you can use your server library.
just check this url, <hostname>:<portname>/sap/public/bc/ui5_ui5/index.html
and you will see a link as The SAPUI5 sap-ui-core.js bootstrap file is available at: /sap/public/bc/ui5_ui5/1/resources/sap-ui-core.js, click this link and you ll get the library that you can refer in your ui5 project.