The phrase "a completely different form" is correct and usable in written English.
It can be used when discussing variations or changes in structure, appearance, or nature of something.
Example: "The artist's latest work is a completely different form of expression compared to his earlier pieces."
Alternatives: "a wholly distinct version" or "an entirely new format".
You could make the same film in a completely different form, of course about the Islamists of today.
A year after co-founders Ian Craig Marsh and Martyn Ware left to form Heaven 17, Phil Oakey's new band had assumed a completely different form.
Standard varieties of celery go white purely because they are grown so close to each other; modern celery as standard is sown at a much higher density, is faster growing and generally sold in a completely different form.
Much of the drama of adolescence — the thrill of it, the pain — is about disengaging from family and finding that connection again, often elsewhere and in a completely different form.
In 1859, Bernhard Riemann, a mathematician at the University of Göttingen, on his election to the Berlin Academy of Science delivered a short paper in which, expanding on ideas of his mentors, he profoundly rephrased these questions in a completely different form, and offhandedly posited what turns out to be the essence of the issue.
Mumbai really needs a completely different form of government, one that would ideally be led by a mayor who could give his authority to all the endeavours that the city requires and be held responsible for both their successes and any shortcomings.
"In modern society, food is highly industrialised and often comes to our tables in a completely different shape from its original form".
Leading up to last week's event, like everyone else, I kept reading the rumors about a new iPhone with a larger screen and completely different form factor. Quite frankly, I was hoping they were wrong.
All such processes, although completely different form each other, are formalized as high-level process nodes in the model.
He added: "Handing over the reins of our galleries to a performer from a completely different art form, be they singer, dancer or actor, is incredibly exciting.
"But it is pointless to pretend that in today's world there is not this new threat of global terrorism of a completely different order form the past".
