If the VPM voice file isn't supported in the firmware then it won't be recognized by the device and may even prevent it booting if you add it manually. You can modify the firmware to replace an unneeded supported voice with the one you do need provided you use the correct type of file for the device. Read this: [Only registered and activated users can see links. ].
The other way might be to convert the Asian device to US/EU firmware but that's only possible if they have matching PCBs and even then doesn't guarantee successful cross-flashing. Inherently more risky as well. Unless you're quite skilled in fw modding, best to just try adding the Portuguese voice support to the Asian fw using RGNVoiceEditor.
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