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Answer
No, the BL5340 and BL653/BL654 are not the same pin mapping or layout, a whole new design is required for a PCB to have a BL5340 fitted. That being said, the reserved pins on the BL653/BL654 are:
- QSPI (BL654 only, no QSPI on BL653)
- SPIM4 (SPIM4 only, this is the high-speed SPI port at 32MHz)
- TRACE
- 32KHz Crystal
- NFC
On the BL5340, the list is similar:
- QSPI
- SPIM4 (SPIM4 only, this is the high-speed SPI port at 32MHz)
- I2C (only if they plan to use 1Mbps I2C which might be known as I3C?)
- TRACE
- 32KHz Crystal
- NFC