Ian Stephenson, an executive at consultant engineer Sinclair Knight Merz, said the two roofs were structurally similar.
Another engineer, who wished to remain anonymous, said: "The similarity is that the outer part of the structure is in tension, and the inner part is in compression."
The Eurostar spokesperson said: "We had a trial section built at Wetherby in west Yorkshire to test the engineering before we went ahead with the roof's construction."
Unlike the roof at Terminal 2E in Paris, which was constructed of a combination of steel and precast concrete structural elements, the structure of the roof at Waterloo International is constructed entirely from steel.
The roof of the station is more than 400 m long and tapers from a width of 48 m to the north to 32 m in the south.
Waterloo International Terminal, one of the world's longest railway stations, was designed by architect Grimshaw. It was completed in 1992.