Can I use the same TimeMachine backup (ext.drive) on my desktop and laptop (but one running Lion, the other Mtn.Lion)?

Want to use the TM backup from my desktop to keep my laptop up to date when I travel, and then vice versa, when I return.  The laptop (MacBook Pro) is running Mtn. Lion 10.8.3, but the iMac desktop is running Lion 10.7.5.  Is this even possible with the same external hard drive being used to go back and forth like that?

You can use the Time Machine backup files of the iMac onto your MacBook without any problem because your MacBook has got a newer version than the one the iMac has got. However, you shouldn't do it in your iMac, and if you do that, you might damage OS X because your Time Machine apps will replace Lion apps.
You can still restore individual data onto your iMac > http://pondini.org/TM/E3.html Note that you can back up both Macs onto the same external disk, but you can't use the same backup in both, so Time Machine will create another backup for each Mac you have

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