Yes, those are 40's on 4-strings... Deans are weird
It actually makes sense because the three pickups (35,40,45) are a bit different on the inside. The coils are different sizes, and that effects the tone of the pickup.
Maybe they tried both and like the 40 better. Another reason might be that it's more convenient for them to just order one size that will work with both 4 & 5 strings.
Look at the new Carvin soapbar. They use the 6 string pickup for the 4 and 5 too! That looks weird to me.
I wouldn't do it, but maybe that's why they do.

I love my EMGs, I want more, NOW!