ESP32 Forum

Hello we are currently using the ESP32-WROOM-32D in a device this device was developed a few years ago. This device is also still in production I was wondering if the ESP32-WROOM-32E would be a drop in replacement. I have already double checked the pinouts of the two modules and the only difference between the two is pins 17-22 on the 32E are all listed as NC we don't use any of those pins now on our device. Aside from that the pinout is identical.
I also wonder how compatible the code is between the two modules. IE how much I would have to change. Just a rough guess doesn't need to be an absolute concrete answer.
Thanks.

It should be a drop-in replacement, as long as your design didn't use SPI1 (the same SPI as is connected to the internal flash aka most of the pins on the side opposite of the antenna).