I disagree. It is not that simple. If volume is similar code, then sure. But if you are talking about different styles of coding then you have a lot of other things to consider. On top of this, if you have a language that has very few underlying primitive (such as parentheses in lisp as opposed to [,;.] in other languages) then you actually have a higher comprehension barrier as the reader will need have to examine the role of the primitive as well. Basically, the terser the language the harder it is comprehend a LOC in that language.
On the research note, I do agree that most SW engineering research has focused on 'small problems'.