Wordwizard

a. Unlike as in Boston, the marches in New York were not massive.
b. The storms didn't do much damage in Los Angeles, unlike as in San Diego.

Are the above sentences grammatically correct?

I can see the logic, but the 'unlike as in' sounds really strange to me.

Many thanks.

Native speakers would usually use the following versions:

Unlike [ in] Boston, the marches in New York were not massive.

The storms didn't do much damage in Los Angeles, unlike [ in] San Diego.

I prefer the version that includes the "in" because it is grammatically more coherent.