Can I move disks with data from an older ReadyNAS Duo V1 to a new chassis?

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...can I simplify things by putting the drives with their data into a new chassis?

 

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No you can't.  Netgear stopped manufacturing sparc-based NAS back in 2011.  Everything currently shipping uses different processors, different linux kernels, and different file systems.

If you are using XRAID, you can connect disk 1 to a Windows PC (either with SATA or a USB/SATA adapter), and extract the data with r-linux for windows ( http://www.r-tt.com/free_linux_recovery/ )

You could also try upgrading the RAM in the duo.  The duo is fussy about memory timings.  But there's an old post that says a Corsair VS1GSDS333 will work. ( https://community.netgear.com/t5/ReadyNAS-Hardware-Compatibility/Duo-V1-Memory-Upgrade-Recommended-module-at-this-time/m-p/850464#M5096 )  

But even if you get it working, it makes sense to get a new NAS.  Your duo can only provide SMB 1.0, which Microsoft is deprecating because of it's security issues.  A new NAS supports SMB 3, is a lot faster, and has more functionality.  My own duo is still in service, but only as secondary backup.