They look good but should be a bit more contrast y, like the prints. Bringing down the gamma a bit would make the image look more contrast y while not blowing up highlights as happens by increasing contrast. It will also help make the colours more punchy.

However, hold on a sec, the colours on the IMAX 70mm print should not reflect projected colours. In fact, the lamp temperature would actually make the colours on the print appear warmer than they are in the source. So, the blue-ish tint in the IMAX 70mm film cell sould not show up during projection. The 70mm print was intentionally struck cooler to compensate for the Kelvin temperature of the IMAX bulbs which should make the image slightly more yellow.

As for regular 70mm looking blue-ish, I don’t know whether all the theatrical versions of Interstellar (35mm, 70mm, IMAX 15/70) had the exact same colour timing. It is well known that even individual 35mm prints of other films have varied from each other in look, so this shouldn’t come as a surprise. there is bound to be differences in an organic process as opposed to digital, which is less fun.