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on client side abc, command line, you may also use :
set access backup * abcdr
then run restore on abcdr :
restore -fromnode=abc blablabla
this works fine as well

of course yes : delete it from volhistory before being able to check it in.

try this :
del volh tod=today type=dbsnapshot force=yes
force=yes is an undocumented option ...

roughly : the os looks the same ; the only question should be : are the tapes written using the same format in both cases ? I would give it a try and do the restore db.
I remember we had issues...

of course you can control deletion of successive dbbackups by scheduling daily :
del volh type=dbb tod=today-1
(or -2 or -3) after running dbbackup scheduled script
though it's far better (and...