16196395 and 16197427
Apologies. The C3 manual trans ecm is 16196396. The 6395 is interchangeable with 16197427.

Using the bcc lookup from moates, it lists quite a few manual trans bins for the 7427 pcm, but I have no idea what those were for (car, truck, van, etc..)
There are none specifically listed in GM's database for a 7427 and either of the 5 speed transmissions GM offered in the smaller trucks / vans. There were three part numbers associated with that pcm over the years so maybe someone's done the work to cross them to the 7427 in that list. In the GM database there was an entry for transmission type which was sometimes left empty. If the person making the excel spreadsheet assumed that meant manual trans there are going to be a bunch of errors.

Tunercat has a calibration ID utility which was made using the GM database. It can be used to cross check cals from the spreadsheet.

would you simply copy and pase over the changes you made to one table into the 2nd one to make them both match?
In the beginning, yes. The closed throttle table is primarily for idle and low speed driving.