I'm not sure.
An Electrical transformer uses two or more coils in a mutual magnetic field to change voltages/current., or provide an isolated power source at same voltage. Autotransformers maintain steady output voltage despite input fluctuations. . Many use Si steel laminated cores, higher frequencies use ferrite.
An Electronic transformer might be an Electronic Ballast; it uses solid state devices to kick line frequency up to 25KC so the back EMF of a single winding choke can be used to transform voltage/current. Or, the hi frequency allows a light, ferrite cored transformer and fewer windings to save manufacturing/copper costs/ weight/size. . Copper magnet wire is getting expensive, so is winding a transformer or motor. . Many ballasts for fluorescents and Neon tubes are now electronic. Some hi voltage electronic ballasts use only voltage multipliers, no wires at all. So in some cases an electronic"transformer" is a misnomer although output is same.
.I tried to fix a microwave oven the other day that used an ":electronic transformer". * Many later TV sets, before flat screens, derived all the operating voltages off the flyback, which ran at 15, 750 Hz. This saved cost of iron core transformer, but put more strain on HO transistor. If your 1980 Zenith quits, probably that big transistor in heatsink near flyback.
Fixed 25Kc switching power supplies professionally 8 years; Tesla Coil and other hi voltage projects. * The microwave had a bad control board, hi voltage inverter wouldn't come on. Cant get parts or schematics for C/Bs, a new board is $45-$60, new microwave only $60.