On the SK-Board pin 175& 176 are used for the LCD-Touch-Controller, 127 & 128 are free to use. So the software framework may prevent the use of this pins for other access. From a hardware point of view it may be exactly the opposite: It is no problem to use more than one device on an I2C-Bus if the adresses are different and the access takes place in a coordinated way. But on pin 127 & 128 you would have to connect pull-ups, which are already there on the the other SCI.
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