[Radio Wrangler]

Shunt C - Series L - Shunt C filters are common in filter design books. The thing to note is that they go low-Z out of band.

Series L - Shunt C -Series L filters according to the books can give the same response. BUT the stopband achieves rejection by going high-Z

So suggesting they are equivalent is rather misleading as it often relies on ideal conditions of matched source and load impedances applied to the filter across not only the passband but also the stop band. Life isn't usually so kind.

David