Leica TPS 1200 - Parani (COMM) connection without Geocom - Will it work?

Per the title. I tried to dig up the answer via a search to no avail. It might be lost in a post somewhere but easier/quicker just to ask.

Will a Leica without the extended Geocom work if I create a COMM link with the paranis? Or do I have to make sure my gun has the Geocom before buying?

A non-geocom gun doesn't go for much of a discount, but it does increase the purchase options ever so slightly.

Thanks!!