Both 780 AM and 96.3 FM are placed on the same location with a standard analog dial. Their formats couldn't be father apart!
Some stations did try to pick an FM frequency that closely matched the AM slide rule dial position on an AM FM radio. But every radio is/was different. I imagine with enough trimmers in the oscillator and RF sections, it could be done closely. I don't know if that would sacrifice other quality issues, and cost a lot to design and manufacture. It would be an extension of the idea of aligning the RF and Oscillator sections on AM radios with differently shaped capacitor plates, and the OSC capacitance smaller to tune it 455 kHz higher, having less plate area and numbers, which was necessary for single knob tuning. Previously, early superheterodyne radios required one knob to tune the OSC section and one to tune the RF section. Tuned preset buttons even continued that way until Delco GM came up with a mechanical preset solution. Take a look at a really old one. A lot of car and radio enthusiasts have them unhoused in their home garages. You'll see how the mechanical stops work.
Up near the other end and the other side of the Lake, near where David our Administrator used to take vacations, I stayed several times at Crystal Lake, West of Traverse City, fairly close to Lake Michigan. My AM/SW transistor radio didn't get WTCM, then a Class IV on 1400 with 1000 watts Day and 250 watts Night, very well in the Daytime and almost impossible most Nights, about 20-25 miles away across sandy soil. I noticed that someone had a radio in their window at that resort, that Day and Night, WTCM blasted in on without interference. They had it on every Day when there was Detroit Tiger Baseball, where everyone else near there listened to WJR 760 for their games at Night (and possible but difficult even on a GM Delco car radio with the telescoping antenna fully extended in the Daytime). I didn't realize that it was actually WTCM-FM, which had recently signed on 103.5, and the dial positions matched fairly closely on their radio.
Speaking of WJR, their AM FM dial positions closely matched also. WJR is 760 and WJR-FM was 96.3. Back when Mike Joseph made WBBM-FM 96.3 Hot Hits around 1982, it was coming in on tropospheric conditions in Genesee County, capturing WJR-FM 96.3. So I knew what was coming when WJR-FM 96.3 became WHYT, a nearly identical Hot Hits format, a few months later.