Is it normal for the new warm white LED minis to look pinker next to old incandescents?

The color shift you are seeing is almost certainly due to the difference in spectral output between modern LEDs and traditional filament bulbs. It isnt your eyes playing tricks, but rather how the two different light sources distribute their wavelengths. Traditional glass bulbs emit light more uniformly across a broader range, which gives them that classic yellow-orange glow. Modern LEDs, even high quality warm white ones, rely on gallium nitride chips that produce a very focused, specific spectrum that ussually leans more blue and green in the middle of the visible spectrum. This is why they often look a bit more 'clean' or sometimes slightly pink to the human eye when placed directly against an older bulb's warm, diffused light. The color will not degrade or change as they run; it is a fixed quality of the light source.

Regarding mixing them on the same house, distance is the factor that helps. From the street, the overall color temperature is what matters. If the color temperatures of your new sets and your old sets are close enough—like both being consistently in the 2700K to 3000K range—the overall effect will usually look acceptable from a distance. However, for the best look, especially on high-visibility properties, running a single consistent style or having all lights within a very narrow temperature band is always the safest bet. As for dimmers, be careful. That simple plug-in dimmer from the hardware store that handled your old bulbs is likely designed for an incandescent load. You are probaly running into the exact issue you worry about: LEDs often do not dim well on those types of switches. At lower settings, they can cause noticeable flicker, buzzing, or worse, they may drop out entirely. Most homeowners who switched to LEDs had to replace those older dimmers with a specific low-voltage LED-compatible dimmer, usually rated for higher power than you might think, to ensure smooth operation.

The advice about the dimmers is spot on. I ran several sets of those new warm minis last season and saw exactly what you are concerned about when you go to the low end of the dial. They started flickering like a strobe light at about the twenty percent setting on my old switch. I ended up replacing the switch completly just to get smooth, consistent operation from those LEDs.

I've found that when running a heavy load of those new LEDs on a roofline, the subtle heat generation can actually cause minute fluctuations in the light output if the surrounding fascia isn't reflective. It's not a color change per se, but the perceived consistency can be affected. My biggest concern, which differs from the discussion on color accuracy, is whether the sheer number of units you plan to deploy will exceed the sustained amperage of the original, older outdoor wiring, which often wasn't rated for high-density LED usage. One must account for that power draw to ensure the voltage drop doesn't subtly alter the intensity of the light across the entire span.

Update: swapped in a newer dimmer like the second reply suggested and the flicker at the low end is gone, so that part is sorted. Still stuck on the tint issue though. The pinkish cast next to my old sets bugs me from the driveway. Anyone actually hung both types up and lived with it, or did you end up going all one kind?