The dedicated SCL/SDA pins are for the SSP (Synchronous Serial Port).
The SSP module can do SPI or I2C, in Master or Slave modes.

The I2CWRITE/I2CREAD are bit bang routines that don't use the Hardware SSP, so they can use almost any pin as SDA and SCL.

There aren't any PBP commands that use the SSP directly.
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