Do you mean there might be separate minicolumns for L2/3 and L4 vs. L5 and L6? It think it might be sublayer-specific because L6a seems linked to L4 and L6b to L5st. For example, L4 excitatory cells mainly project to L6 in a minicolumnar fashion (http://www.jneurosci.org/content/jneuro/31/50/18223.full.pdf). I recall L4 doesn’t target L6b much, so L4 and L6a might share minicolumns. L6a mainly targets L4, whereas L6b mainly targets L5a, so L5a and L6b might share minicolumns. That’s just a guess, though.
L5a and L5b don’t share minicolumns at least based on firing synchrony (https://science.sciencemag.org/content/358/6363/610).
I think you would need to read about interneurons to figure this out. I think the ones with minicolumnar projections are called bipolar cells = tufted cells. They project from L2/3 to L5 in a minicolumnar fashion (“Synaptic biology of barrel cortex circuit assembly” pay wall).