There is another thing to consider. I too, thought it was more of a temperature thing causing the color differences BUT a simple google search revealed something that I was not aware of. With the reds, raspberry, purple and blue pigments, acidic conditions cause red colors, alkaline conditions cause more of a raspberry purple, or purple color in flowers.
In either event, I don’t think that colors change drastically in a few days of shipping or by a warmer night or two in a greenhouse.
It would be an interesting experiment though to take two divisions of the same Cattleya, grow them side by side, and give one say slightly alkaline water/fertilizer at a ph or 7.6-7.8 and give the other water a fertilizer at 6.2-6.4 and see after blooming, just how much that the color might differ?!