Here are a few of mine side-by-side. They are not really 'base' morphs because they have some recessives present ...but they are good representation.
WT: No head stamp. Darker hue.
Fire: I look for a lighter color and a circular 'blob' head stamp of some sort at the back of the head.
I personally can't identify the flame patterning that everyone else seems to find.
Enchi: I look for a gold*ish color with banding (which may/may not be brown). Head stamp on an Enchi can vary significantly: usually represented in my collection as a Clover or Horseshoe. Varying amounts of yellow can be seen on the side of an Enchi depending upon the level of expression.