The top pic is of a classic buckskin Leonis phase thayeri and shows very well the classic narrow red dorsal bars.

In my opinion the juvenille snake in the two bottom pics is not a greeri. The head pattern is tri-lobed or what some people call a three leaf clover, plus it has red in it. Greeri rarely have red in the head pattern and a three leaf clover shape is almost unheard of in greeri. I think that snake is a San Luis Potosi King.
San Luis Potosi Kings typically have a three leaf clover head pattern with red in it and they usually have squarish shaped dorsal blotches. What does the belly of your snake look like?
Greeri usually do not have any red on the belly. San Luis Potosi Kings usually have red, black and white mottling and barring on the belly.

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