Richard
No, the actual drawing is identical to the Rider-Waite. There are no black outlines in the rainbow, so it is just a color variation in the sky. I think I read somewhere that an early draft of the Rider-Waite did have a rainbow in Temperance, but I could be mistaken.Don't some of the Albano cards actually have different images from the RWS? I'm thinking of the rainbow above the angel's head on Temperance, for example. This would also make it less of a clone.
ETA. P. F. Case's BOTA Tarot also has a rainbow. Albano may have gotten the idea from that, since apparently Case influenced Albano's coloring.