Default [Q] Build.prop: multiple voices related to the same property

When there are multiple voices that define the same property but with different values, which one is managed by the system?
Example: considering
net.tcp.buffersize.umts=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.umts=6144,87380,110208,6144,163 84,110208

does the system acquire/manage the first one or the second one?
Thanks
sverzA