Two large slugs

The current dry weather means I am not coming across as many terrestrial molluscs as usual. While moving some pots I came across these two beauties, the Yellow slug (Limacus flavus, top) and the Irish Yellow Slug (Limax maculatus). After a while they relaxed on a wet white bowl and let me take their portraits before being returned to the plastic pot pile. Until recently, they were considered the same species, but these two look very different, not only in coloration, but in body shape, despite being a similar length. Both are very common out and inside my house, and are active at night.
I found this useful slug key in the field studies website.