Arduino pro mini and arduino nano 33 ble voltage question

Projects General Guidance
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Hello!

I have 2 boards. One Arduino pro mini(3.3v 8mHz) and one Arduino nano 33 BLE (3.3v). The arduino nano can use a 5v voltage to give to my sensors. i want these two boards to be connected via Serial. Will it be fine sending from pro mini to nano or the pro mini will send more than 3.3v voltage, and then destroy the nano? Also i wanna have a micro SD powering with 5v ( pro mini) but sending data to nano via SPI. Will it also be fine or it'll send more than 3.3v voltage and destroy the board as well?

PS. The nano will be the Receiver( master) and the pro mini the transmitter ( slave).

Thank you in advance!

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What makes you think that?
Normally if you give a sensor 5V it will return a signal up to 5V if it is an analogue sensor or a 5V digital signal if it is a digital one. This is too much for the pro mini and the nano 33 BLE.

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