If you were unable to reproduce the problem, it is probably because the configuration files are correct. Tried changing your gpsd file with the previous values, and you should end up with the mount problem again.

IdVendor is the name of the company that produces several products (idProduct). The products are found in different rule files with the (unique) company id in front.
Look at these links to better understand the rules files:

devicehunt.com/view/type/usb/vendor/067B/device/2303

unix.stackexchange.com/questions/44308/u...ermissions-in-libusb

forums.opensuse.org/t/udev-rules-priorit...with-operator/100210

Your cable contains a PL2303 chip and not FTDI. So nothing to change in 69-libftdi.rules and you must leave it in 25-gspd-usb.rules because the PL2303 chip is used in some GPS

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