trim - Colonial style casing / backband and alternatives

Here's my issue, I have windows and door casing that appears to be 1x6 that was custom routed, my down stairs is almost identical but has a backband. My current baseboard trim I've come to find has

3″ MDF Colonial Backband Casing : Pinevalley Trim and Doors

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Ornamental Mouldings 1-1/16 in. x 1-3/8 in. x 96 in. White

Architectural Trim and Mouldings

Moldings - Classic American Molding Collection

What is this style door casing called? : r/Carpentry

Upgrading the Basic Trim Package for a Colonial Home - Fine

4 Tricks to Match Old Trim - The Craftsman Blog

trim - Colonial style casing / backband and alternatives

Classical Colonial Door Casing - WindsorONE

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Toucan Back Band Casing Colonial - 1 (25 mm) x 3 x 8' (C-04

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Trim & Accessories - Kolbe Gallery Ontario