I believe the Guatamalan Spilotes are more likely to be of the "speckled" coloration. Spilotes are so variable and can be collected from numerous areas and only shipped from the one. South American Colubrids are very understudied and at this point until someone goes down there we don't really have any facts to go, on just speculation. Hope that helps you be as confused as me.lol.
Nate