I have not printed these specific ones, but I have printed 3dBreed Britons, Germanic and Celts. I am also working on their WWII German and American. They all seem to be similar in size and shape. However....
This pictures shows a 28mm Kardakes taken from the file and it seems like 26mm in size to the eyes. So, A little small. They are heroic scale, which means they are thicker. The numbers I use in this picture with one that is unchanged show a better size and scale, at least, to me.

Here is a top view comparison of the same picture.

Here is a frontal of a Sparabara on left, Immortal next to him. Then the Kardakes, the one changed and then other unchanged on the far right.

I hope this info helps.