Yes. The buyer searches are different, the project timeline considerations are different, and the content that converts is different. A buyer looking for a custom home builder in Portland wants to see portfolio quality, material choices, and design process. A buyer looking for a duplex or triplex contractor wants to know you understand Portland's permitting process, infill lot constraints, and RIP2 design standards.
Home builder local SEO for middle housing specialists in Portland should target a completely separate set of keywords from custom home terms. Searches like "duplex builder Portland Oregon," "middle housing contractor Multnomah County," and "fourplex builder Portland" have growing search volume and thin competition in the local SEO Map Pack. If you do both custom homes and middle housing, each service type needs its own page, its own GBP service listing, and its own local content strategy. One generic "we build homes" page won't rank for either.