no. imperator has a crest like muticus and is an electric green colour not the dark green of siamensis. In low-light, it is a bluer bird than siamensis. Facial skin is more yellow than orange. It has less barring and more iridescence on the wings.
There are few photographs of females to do a good drawing I think mine wasn't good, here's just the male coloured;
(Basically I took my siamensis plate and recoloured it and replaced the crest with that of Muticus Muticus
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Muticus muticus and Malacense are rather different. Malacensi looks very similar to nominate imperator but the backplate is a rosy colour. The neck is a bit "duller" when compared to nominate muticus.
Malacense:
Wolfgang Stock (possibly nominate, but likely composite between muticus and annamensis races):
Here's an usual captive specimen in Thailand:
I believe it's either a malacense or a form of annamensis.
This is something I am uncertain of since Resolution labelled it as Malay muticus but it's almost certainly the "spicifer" at Jurong Bird Park.