I'm not really sure what you mean, GBIC is a type of interface convertor and usually has SC Fibre connectors, the mini-GBIC you are referring to may be an SFP which is a smaller type of interface convertor and usually has LC Fibre connectors.
GBICs and SFPs will work together as long as they are the same type ie Single Mode or Multi Mode and you also need to make sure the TX and RX Optical Power levels are within the specified limits at both ends of the link.
On some switches the command "show inventory" may show the type of interface convertor installed.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...