I could be way off but suggest the earlier workouts was aimed at where Ben was at that tiime (below 10s) where the later work is aimed more towards the development of athletes Charlie was helping at the time…
A lot of beginning (for want of a better word) athletes top up the training program set for them and it is only after several years they stop doing so.
I would start with the Vancouver workouts and progress to the CFTS when ready. Having the full CF system and comparing them can only be an advantage.
wasn’t it Charlie who said nothing is set in concrete.