WIll custom old heads work with EE?

Hey,
From what i gathered heads now consists of 4 file extensions: mdl, plt, dds, and mtr .

When I downloaded Bastila Head Model I noticed there are only 2 head files a mdl file and plt file.

So if I download the old diamond edition head pack will it work with nwn ee right out the bat or not?

Thanks for the info,
Cheers

Old heads work fine in my experience.