Sasi,
Hello, the SCXI-1349 adapter is is used for connecting 68-pin MIO E Series devices to an SCXI chassis.
The SCXI 1353 (comes with two adapters) is used for connecting 100-pin MIO E Series boards to an SCXI chassis. The first adapter is identical to the SCXI-1349, while the second adapter routes the extended analog or digital signals to the SCXI digital modules or breadboarding modules.
Good luck with your application!