Almost anything should work with Carnage and Glory.
RFF should be workable, but a two stand deep line--I believe the rules call it a "solid" or "reinforced" line--is going to look really strange since the rules presume all infantry are based three to a base more or less in line.
Johnny Reb II will work, but you'll lose a lot of the flavor since Johnny Reb uses different numbers of castings on a base to represent different size units.
Gettysburg Soldiers I'm not familiar with.
You might look for original--brigade level--Fire and Fury or On to Richmond, both of which were written for pretty much your basing. So were Touched with Fire and Mr. Lincoln's War. And I think what you've got will work with the old Larry Brom ACW rules. I can't remember the title, but Lori Brom of SergeantsThree should be able to fix you up.
Adjustments. Most of these assume either a 1" or a 2" base. If there isn't a table for 1.5" bases, either take a 1" system and add 50% to all distances, or take a 2" system and use 75% of distances. (Taking a ruler and getting it reduced to 75% on a photocopier will work.)
If you're using 1.5" bases and distances and the rules are written for 1", do try for the deepest table you can handle. Otherwise you may lack depth for some scenarios.
Hope this helps.
adds artillery to his soft-plastic Union forces.