Quoth Erik:
> There is no difference between tar files created on 32 bit or 64 bit
> machines. There can be differences between GNU tar & (for instance)
> solaris tar. What problem are you having specifically?
This is the error I was getting:

tar: Skipping to next header
tar: Archive contains obsolescent base-64 headers
tar: Error exit delayed from previous errors

Our sysadmin thought the problem was because server #1 has a 64-bit 
architecture, and server #2 is 32-bit machine.

But Erik's hint on the GNU/Solaris divide lead me in the right 
direction: I found someone referencing a tar+gnu+solaris problem when 
files are FTP'd as text, not as binary. I transferred the files in 
binary mode and everything was fine. I had mistakenly believed that was 
the default mode...

Thanks!
Ken