You can use any TX to send to the GTX327 but the SV RX and TX have to be the same baud for the same port. So if you have GPS495 (TX) -> SV (RX) on port 4 at 9600 baud, you could also have SV (TX) -> GTX327 (RX) on port 4 at 9600 baud.
What you might want to do is use one SV port to TX and RX...