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What is the difference between the suffix TW and TD for QMB switches?

Can I use a switch with TD suffix , for a TW switch, or visa versa?

Product Line:
QMB Panels

QMB Switches.

Product features 

The TW is a suffix on the current design Series E QMB twin switches and TD is a suffix for the obsolete design Series D2 QMB twin switches.  They are not interchangeable.
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