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These essentially are different terms for the same thing. Partial and focal epilepsy both mean your seizures are coming from one small part of the brain. Focal to bilateral seizures mean that the seizures also start in this small area, then spread to both hemispheres most likely causing you to have a tonic clonic seizure.
For more information go to Understanding Epilepsy https://www.epilepsy.org.au/about-epilepsy/understanding-epilepsy/ for a good explanation of these terms.