I dont know in real life, whether there is a big difference between a Seagave pumper cab, and the Seagrave RML cab, although as we are really talking about a 1/32nd scale model, would the difference if any, mattered.
I am only saying this because I cannot see the L10 being all new, and they would in fact be using the old cab they already have the mold for, albeit they would have to fill in the hole under the front grill, and looking at photo's at hand, the rest looks the same including the bits on the roof.
Its only logical they would use it, it works for me.
Can anyone think of a reason they would not, as I am not familiar with any major differences.

Location: London UK