Most likely you will need the same software, unless the LTOs were written with standard TAR (Cache-A does this by default) or the new LTFS (which, as far as I know, has been added as an option by both Tolis and Cache-A for LTO-5 setups). Almost anything else will require the same software that wrote the tape to read the tape. Check with individual vendors to know for sure.
Best,
Andy Richards
VP of Product Development
Keeper Technology