Well, the answer is yes. Itís possible to hybrid them, the question is do you want to? Crossbreeding is a long drown out process with a minimal success rate. The babies are often not healthy, as in the Borneo bat eaters (cross between the Burmese and Reticulated pythons.) And often even the healthy hybrids will not grow up to reproduce. In the case of the bat eater you cross one $100 snake with another $100 snake and you make a $2000 snake, so there is some return on the huge time and energy investment of crossbreeding. In your case you are crossing a $5 snake with a $5 snake and getting a $5 snake. Garter/ribbon hybrids will still end up as coral snake food just like ribbons and garters.
www.SCReptiles.com 2.2 Crotalus adamanteus. 2.2 Crotalus h. atricaudatus. 2.2 Crotalus h. horridus. 1.1 Agkistrodon p. piscivorus. 1.1 Agkistrodon c. contortrix. 1.1 Agkistrodon c. mokasen. 1.1 Agkistrodon c. laticinctus. 1.1 Agkistrodon c. pictigaster. Agkistrodon c. phaeogaster. 1.2 Sistrurus miliarius barbouri. 1.1 Micrurus fulvius. 0.0.1 Micrurus fulvius tenere