I would guess that you’ll need all the regulators and interior handles. That was the case when I went from manual to power in my 55 bird. The glass and the channel were the same. Given that Ford tended to use what’s in the parts bin, I’d guess they were similar, at least as far as the motors, switches, relays went.
That would allow you to rewind the motors, etc, as necessary if you can’t find manual units. FWIW, the regulators with out glass, switches relays,etc. for the bird were $1200 15 years ago. I’d think they’d be more than worth the investment to keep the car original, but if you change them out, don’t throw the electrics away.
My door panels had pre stamped locations to allow the fit of either handles or switches. If you change over you may need new door panel.