Alternate part for stm32f407Vxx MCU which can be replaced one to one

[Cpatt.1]

..

[Javier1]

footprint

[Cpatt.1]

yes with same footprint

[Javier1]

LQFP100?

What do you mean by alternate part, what do you need from that chip, woud you settle with less power, no floating point? cost? Any key peripheral you cannot miss?

Do you want to stay within ST products?

[Paul1]

Use STM32CubeMX to search for compatible ICs.

Try all STM32L4x7 (series should be firmware compatible, but tests needed, and need to confirm all IC features you use exist.).