My game size is smaller using Launch rather than Packaging is this normal?

Hello, so today I decided to try the “Launch” tool to packaging my game, and my game got lower in size than when I used the packaging tool, which is honestly weird, is this normal? game seems working fine, I added extra stuffs since my last packaging, so I am a bit confused… When I first used packaging the size was 3gb, now the size reduced to 1gb using the launcher, that why I am a bit confused