GPS + 900Mhz Communication - 1 Aerial

Hello

I have a device that transmits communication to an external network at 900Mhz via connection to a port on the chipset.

It also has another port on the chipset and can connect a GPS antenna (the chip has a GPS receiver on it). GPS communication frequencies are 1575.42 MHz / 1227.60 MHz.

Rather than use two aerials, I'd like to try and use one 'puck' style aerial. Is it just a matter of purchasing something similar to this:

https://au.element14.com/siretta/tango22-3m-smam-smam-smam-26/puck-antenna-0-85-2-4ghz-sma-3m/dp/2717705

And plugging the external network chip and GPS chips into the different puck ports? Also, all of these puck aerials seem to come with long cables (~3m!). Is there any issue with shortening this to 100mm?