Beaufighter / Mosquito
57' 10" (17.63 m) / 54' 2 " (16.51 m) - Wingspan
503 Sq Ft (46.7 Sq m) / 454 Sq Ft (42.2 Sq m) - Wing Area
41' 4" / 44' 6" (13.56 m) - Length
15,592 lb / 14,300 lb - Empty Weight
"much" is a subjective term, but I'd estimate it was about 10% smaller. The wing in particular, which is usually where most of the fuel goes, is just about 90% the wing area of a Beaufighter.
My original point which you may have forgotten was that you didn't need to turn a Bf 110 into a Beaufighter to give it long range. The Me 210, for all it's faults, had nearly twice the range and fuel capacity (2,500 liters vs 1,200) of a Bf 110 with a somewhat smaller wing.
My understanding is that the normal practice with the Ju 88 on a long range strike was to put extra fuel in the internal bomb bays and carry 250 kg bombs on the external hard points, two 250 kg bombs is about 1,100 lbs. And a hit with a 250 kg bomb can sink a ship like the SS Ohio, which is what they needed to do most.
It could carry much more (up to 2,000 kg for an A4, according to
this source) but that wouldn't be as common for a long range strike.
I don't know the precise range of a Ju 88 carrying a bomb load, but the "normal range" was listed as over 1,200 miles, and I know that Ju 88 units stationed in Crete did strikes on Malta which is around 400 miles I think round trip. No Bf 109 could make that journey, though of course they could fly from Sicily.