The alternative part for the Clipsal 30M20 is the
30USM: Universal Rocker Switch, 1-Way/2-Way, 250VAC, 20A.

Please go to the website via the following links below and check under the Documentation Tab for more information.
Australia - https://www.clipsal.com/products/detail?CatNo=30USM&itemno=30USM-WE&backto=/search?q=30USM&tab-document-1=0
New Zealand - https://www.pdl.co.nz/products/detail?CatNo=30USM&itemno=30USM-WE&backto=/search?q=30USM&tab-document-1=0