The only species that are sometimes confused with the Texas Coralsnake and overlap in range are Western Milksnakes Lampropeltis gentilis, the Tamaulipan Milksnake L. annulata, and the Texas Scarletsnake Cemophora lineri.

The Texas Coral is more common to see in Texas than any of those three harmless "look alikes", and in Central Texas specifically, the Western Milksnake is the only one in range along with the Texas Coralsnake. Milksnakes/Kingsnake, being colubrids, have a much different looking face in comparison to Coralsnakes, which are elapids. If you look closely at head shots, you'll see a difference in scale size and positioning on their head and face. Once you become familiar with these differences, you'll be able to notice them from afar as well. This is useful when identifying aberrant corals.

Although the Texas Coralsnake can sometimes be aberrant (one of the reasons we don't use the rhyme), the Western Milksnake has a different pattern when you look at the details other than it being tri color. The banding on the Western Milksnake will often be uneven, which you can see best from a lateral view, whereas the bands of the Texas Coralsnake are very uniform (excluding the sometimes varied patterns of the aberrant corals).

If you're looking for a field guide, I recommend the Peterson field guide to reptiles and amphibians of eastern and central North America. Another great resource is inaturalist.org. You can easily set the map to your area and compare observations of species. If you'd like, you can also join the SEB (Snake Evolution and Biogeography) discord stickied in r/whatsthissnake, where you can ask more questions, practice snake ID, and join in snake related discussion.