FWIW, and possibly unfortunately, I agree with your friend. The short moment when the door is open isn't sufficient to justify matching the satin nickle inside; and IMHO, metals within eyeball range should be at least of similar color. One sees (even if not consciously studies) the exterior lights and exterior knobs as a decor unit, and upon departing, the room's interior knobs (whether cabinet or several doors) are a different unit. I realize the SET of mix/match knobs looks strange while it's in your hand, but honestly, once installed, I don't think anyone ever stands at the door's edge in order to eyeball the interior and exterior knobs at the same time. I suspect you'd have to work hard to name any m/m sets in your present world, and yet there are likely to be many (especially on bathroom doors).

Thank you I'll check out the pewter. I'm not just going based on the range, I have a large (really large lol) collection of mid-century kitchen accessories that I plan to display in the kitchen/breakfast area. Many of these are shiny chrome, think Sunbeam mixers and metal canisters. I also have a lot of pink and turquoise dishes, colored milk glass and other pastel kitchsy kitchen stuff. Outside of the kitchen and bathrooms I favor more transitional decor, not modern or glam by any means. I do like some vintage/antique elements. I have several pieces of Victorian furniture in my living room and entry currently that I plan to use in the new house. My style is a a little eclectic, anything from about 1890-1960 and I like it ;) This post was more regarding door knobs but overall I have a bit of a design dilemma to make everything cohesive. At this point I'm trying to choose a good foundation to decorate around and I think I have done that in everything but the hardware finishes. Now I feel like I need to keep thinking. Thanks for your help Jan.

IMO the exterior and the interior do not need to match is anyway. But you might find it difficult to get the mix you want for the exterior door.

If you only need a key on outside locks then you can by exact same door lock/deadbolt combo in each color and interchange parts easily. If you want interior keyed deadbolt you would either need to use both keys or have your locks rekeyed.