Packaging on Mac exports twice the file size as on PC

I have a UE4.21 project that I’m developing on PC, and with all the various tips and tricks for reducing package size I was able to get the final packaged product down to 90mb. However, when I take those same project files and put them on my mac, open them up in 4.21, and export the same package, the package size is 180mb. Every setting is exactly the same, so does anyone know why there’s a discrepancy? Is there any way to get my Mac export size down?

Any luck on that? I have the same question.