J
Over the past 20+ years, UX has swung from specialist roles to generalist, and back again, while some companies have held onto roles that worked for them. What you're describing sounds like information architect (IA) or UX architect work, which may be low fidelity but which drives a core part of design: how it works.
I've worked at places where the IA/UX architect did flows and wires, and the UX designer/visual designer/interaction designer did interaction design, visual affordance, accessibility, branding styling, etc. Sometimes there are even more roles: editorial, content strategist, UX strategist (not an IA or wire "conceptor", but someone who creates principles and goals for design to work from and toward), taxonomist, etc. You can get a good idea of fundamental UX flow and activities from Jesse James Garrett's classic Elements of UX diagram: http://www.jjg.net/elements/pdf/elements.pdf . Everything goes from the bottom up.
If the above is the case for you, then you and the "UX conceptor" should align on a workflow process. (You might also consider using something like Figma, which allows for things like an easy-to-use shared component library that might make changes easier in your work. Or, a living style guide if you work in code.)
OTOH, I have worked in places where a PM or executive acted as a UX designer/architect, considering UX as a "common sense" job and themselves as the target audience. This can result in disrespect for the UX designer's work and repetitious, redundant work such as you describe. If that is the case, I would try to either work in a different department or find a new job.