Late 2013 Macbook Pro Retina 15' will not boot an external disk from a Mid-2012 MAcbook Pro. What should I do?

In order to simplify moving all my files from the previous mid-2012 macbook pro 15' when moving to my new late-2013 macbook pro, i superdup-ed the full hard-disk to an external ssd. Unfortunatelly the new mac resuses to boot from this external disk (i get the grey disk with a line over it). The external disk works just fine so if I boot the new mac from its internal SSD I can read/write the external disk without problems.
Old OS X is 10.9 as is the OS on the new mac.
What I need to do is to boot the new mac from the external ssd, use the same superduper to copy the external content onto the internal ssd.
How can I solve this issue?

Welcome to Apple Support Communities
If you made a backup of your files with SuperDuper, use Migration Assistant (in /Applications/Utilities) to transfer your files from the external drive > http://pondini.org/OSX/MigrateLion.html It will create a new user account with the transferred files, so you may want to merge both user accounts > https://discussions.apple.com/docs/DOC-5472
The Late 2013 MacBook Pro uses a special OS X Mavericks version which makes OS X compatible with it, and older OS X versions do not work with it. That's the reason why you cannot start up from the external drive created from the Mid 2012 MacBook Pro

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Late 2013 Macbook Pro Retina 15' will not boot an external disk from a Mid-2012 MAcbook Pro. What should I do?

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