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Are there any differences between SSD (mSATA) from macbook air 2015 (MacBook Air 13" Early 2015 SSD Replacement) and that of macbook air mid 2011 (MacBook Air 13" Mid 2011 Solid-State Drive Replacement). I just want to swap the old SSD onto my new macbook air. I do not care about speed or such things. The old macbook air mid 2011 already has El Capitan, Are these compatible?
No they are not compatible. For the MacBook Air; 2010-2011 compatible with each other 2012 only works on a 2012 2013-2015 compatible with each other
What you can do is take the SSD out of your older system and place it into a special case so you can copy off your stuff or use migration assistant if your old system is dead. If your older system is working you can interconnect the two systems to either copy off or use migration assistant using Target Mode. Here’s a rundown on Migration assistant: Move your content to a new MacHere’s more on Target Mode: OS X El Capitan: Transfer files between two computers using target disk modeHere’s the needed case to hold the SSD: OWC - Envoy Bus-powered external storage solution designed to complement the 2010 & 2011 MacBook Air