probably not true, since most http/2 implementations that I know of use time multiplexing, which means that only one element at a time can pass, so the time is exactly the same.
I mean if I split a file in 10 exact pieces or if I split two files in the exact same 10 pieces as well I still have the same data.
(Edit: Well basically two files have mostly more data since they both might contain a BOM or so)