I have never tried using ForScan on the Jag's, as I also have IDS/SDD, but I have programmed a new key to my S type with IDS and a new key to my daughters Fiesta with ForScan. The key difference (excuse the pun), is that with the Jag, you have to delete all keys and start from scratch, and you need a minimum of two working keys to program any. With the Ford, I was able to simply add another key without deleting any. I had the option to delete all known keys, and I could have programmed just the one key if that was all I had, so the two systems do differ. Whether ForScan would program a key to the Jag, I don't know.
Regards,
OW