The Mid '12 models were a transition release. Apple needed to come out with something as the Haswell chip series was delayed. Here's the details of the differenced between the two models: [http://www.everymac.com/systems/apple/macbook_pro/macbook-pro-unibody-faq/differences-between-macbook-pro-mid-2012-late-2011.html|Differences between the "Mid-2012" MacBook Pro models and the "Late 2011" MacBook Pro models that they replaced].
Internally the case layout is the same between the two but there is a few stand offs which did get moved! So to answer your question yes a '12 logic bd will fit into a '11 case with some minor fitting issues.
But before you go down that path can you explain why you need to do this? Maybe their is an easier way to address the problem. But we need to know what that is first.