Can I exchange in the future the nRF52832 (QFN Package )with the nRF52840.
Can I exchange in the future the nRF52832 (QFN Package )with the nRF52840.
Unfortunately not. The chips are quite different from each other and there are no plans of making any nRF52840 package that is pin-compatible with any of the nRF52832 packages. Part of the reason being the nRF52840's new power supply options and the additional decoupling pins that comes with it.