compileOnly two similar libraries to produce one APK

I have two jars, the left.jar and the right.jar. They are similar but not identical.

left.jar:

package com.mydomain.config

public class PkgConfig {
    public static int getID() {
        throw new RuntimeException();
    }

    public static String getLeftValue() {
        throw new RuntimeException();
    }

    // the rest of the methods are the same with right.jar
}

right.jar:

package com.mydomain.config

public class PkgConfig {
    public static int getID() {
        throw new RuntimeException();
    }

    public static String getRightValue() {
        throw new RuntimeException();
    }

    // the rest of the methods are the same with left.jar
}

In my activity, I do this:

public void myMethod() {
    if(com.mydomain.config.PkgConfig.getID() > 1000) {
        mDeviceValue = com.mydomain.config.PkgConfig.getLeftValue();
    }
    else {
        mDeviceValue = com.mydomain.config.PkgConfig.getRightValue();
    }
}

And this is how I declared the dependency:

compileOnly files('libs/left.jar')
compileOnly files('libs/right.jar')

This setup gives me an error saying

error: cannot find symbol method getRightValue()

My goal is to create one APK out of this. I know I can use sourcesets and do this:

leftCompileOnly files('libs/left.jar')
rightCompileOnly files('libs/right.jar') 

but it creates two APKs. Is there a way to go around this problem?

from compileOnly two similar libraries to produce one APK