I’m trying to add several cronjobs, they all have very similar instructions, but for different folders, so there is a definite difference. one says…1, the next one says…2 etc. But I get the message not to add the same job more than once. What can I do about that?

You can always add it manually:

I just had the same thing - I went ahead and made a bash script to run them from one Cron job.