Yes. The problem is that both modules are autoexporting the same constants. One way around this is to disable the autoexport like this.

#!/usr/bin/perl
use strict; # with or without this
use warnings; # with or without this
use Win32;
use Win32::GUI (); # Prevents autoexport for this module.
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You can put the empty quotes on either of the calls to prevent the warnings.

Of course this means that you will then need to explicitly request exporting of everything you need from that module.

You should probably check the sources of the modules to verify that the duplicated constants are indeed the same, but in the past I have found this quite a difficult process.