I2c wiring question

Thanks to all in advance for any help.
Question on a Pixhawk board can I wire in parallel two different inputs from two different sources that use the same pins into a i2c port (I do not have a i2c splitter)?
In other words can I parallel wire a USB extension with RGB LED for Pixhawk flight controllers and a Neo 8n GPS into a i2c socket using the same pins on a Pixhawk board without causing damage?

An I2C splitter is actuall just a set of connectors hooked in parrallel.
Take a look at this schematic for typical I2C BUS connection.
Please note that the Pull-Up resistor (Rp) are already installed on the PixHawk