No they're not the same. ' You don't need to use 'a' before heightened though, so the correct form is: There is going to be heightened security all around.
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drew.wardNo they're not the same.You failed to bring out the vital point that "security" is a non-count noun, which is why "a" is not required.
You're correct it should be 'there is...' You don't need to use 'a' before heightened though, so the correct form is:
There is going to be heightened security all around.