Slackware :: Shared Partitions Between 13.1(32bit) And Current(64bit)

Looking for moral support and guidance. Currently have 13.1 running nicely with the following partitions:

/swap
/
/home
/var
/usr/local
/notlinux (my name for a storage partition when I want to start all over again)

I have decided to tinker with Slack64-current with multilibs. My intent is to shrink /notlinux an add a new partition for 64's / . Then dual boot the system.

/swap and /usr/local

I see no problem with mounting these partitions in Slack64. I would have two 'tgz' directories [ tgz & tgz64 ] in /usr/local where I would seperate SBo packages (for my benefit). Don't know what having separate /tmp directories would have on sbopkg but that's not a material issue. confirm I can share these partitions.

/home

99 & 44/100 % sure if I changed/added my name from 'dad' to 'dad64' it would not be a problem sharing the /home directory. But what about keeping the same name/uid#, would things get fubared when I jump back and forth between 13.1 and current-64. Comments?

/var

Think I might be getting into trouble here. Suspect pkgtool, installpkg, upgradepkg ... would all continue to work because /var/log/packages would actually have different names [_64] for the 'same' package. At a minimum I want to share the mysql database so might have to create this as its own partition. Other than it would be a mess reading log file would sharing this directory be a major issue.