The three chaps firing (front row, l to r) #1, #7, (back row, r to l) #3, do have the "2nd Generation" look about them; as do the advancing with levelled musket guys (fr, l to r) #3 and #6, and (br, r to l) #1, #6 and #9, who might be SYW/FIW Highlanders. Not sure about the others - the poses don't look right for that sculptor for one thing. Also, Minifigs didn't make Jacobite figures, as far as I recall - at least not in the UK; however, there were sub-ranges that came out in the US prior to the sale of Minifigs to Caliver, in both 25 and 15mm, that weren't ever available over here, so it's not impossible.
I'm afraid any "2G" Minifigs (these are the first individual 15mm figures, which replaced the original strips in the late 70s and were themselves replaced by the current range in the mid-80s) will be long gone, the molds either dumped or destroyed. I can get in contact with the original sculptor for you, if you wish; he won't have the original molds, but possibly he could make you replacement figures using the ones you have as masters.
"No plan survives the first contact with the dice."
"There is something wrong with our bloody dice today!"