Plenty from the sounds of it.

Just because ya have a free SATA port is no guarantee it will work on both types of drives, or either one of them for that matter. Plus the Hitachi has to be in ModeB before it will show up.
FWToolBox is only for the Hitachi, you can use it to read the Samsung FW and inject the key, but you'll have to use MTKflash to reflash that drive as well as dump it in the first place. You do NOT want to dump the Hitachi FW and flash it to the Samsung, that would be awful. It goes like this, Dump the Hitachi FW, get the key from it, dump the Samsung FW an inject that key into it, then reflash the Samsung with that FW. That of course is the "quick and dirty" of it and certain things have to be met before it's all doable, like having the correct SATA setup and the apps and such to do it, as well as have a semi-working drive to get the key from in the first place.
If the chip you screwed up is the FW chip (the SST chip) then you most likely wont be getting the key off that drive easily either. You'll have to repair that mess first, which most likely will also restore the drive to working order and then there's no need to replace it, or remove the chip and extract the key with an external programmer, which is a bigger mess than what you're already into and if it's damaged more then it may be lost forever.
PM me if you're in te US, I may be able to get your drive going again or at least get the key from it for ya. There are others on the board as well that can do it if you're located elsewhere too. No offense, but I don't think ya should be laying the iron to it any more then ya already have.
