The phrase "are a bit broader" is correct and usable in written English.
It can be used when discussing concepts, ideas, or categories that have a wider scope or range than previously mentioned.
Example: "The definitions of these terms are a bit broader than what we initially considered."
Alternatives: "are somewhat wider" or "are slightly more expansive."
By comparing the four XRD patterns, the diffraction peaks of CHA nanorods are a bit broader than the corresponding peaks of HA nanorod, indicating crystal lattice change induced by substitution of carbonate ions.
The international support also means that the use cases for Hushed are a bit broader than with Burner, perhaps, which claims its app is "perfect for dating, job searches, short-term projects, Craigslist, Twitter, Tumblr, and other social media," or any other time you don't want to use your real number.
— is a bit broader, in that a lot of different components could play a role in someone evaluating it.
I think I'd have developed a lot more, and my mind would have been a bit broader if I'd gone to state school.
The rapping is better, more technically assured, and the worldview is a bit broader, but even at its most experimental, G-Side is still very much a group in the Southern traditionalist vein.
The play belongs to Diane, and even if Tamsin Greig is a bit broader than her Broadway counterpart, she brings the right demonic energy and well-tailored control-freakery to the role: she is diabolically funny in the best scene where, at a lunch with the unseen writer, she conveys her deep-seated disdain for the "fag playwright".
The Council of Europe, the intergovernmental body responsible for enforcing human-rights laws in Europe (its membership is much larger than the European Union and includes Russia, among others), uses a definition of "political prisoner" that is a bit broader and includes, for example, discriminatory application of laws.
