If yes then how?
Coz I wasn’t able to…
Yes of course. Mark the slide on the left, which should be different.
In the sidebar (F5) - Master Slide, right-click on a Master Slide template and select “Apply to Selected Slides”.
Always save first as ODP.
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With me Windows 10 Home; Version 1903; 64-Bit | LibreOffice, Version: 6.3.1.2 (x64).