Sentence 1: Tokyo shares open higher on buoyant U.S. market

Sentence 2: Tokyo shares open higher following strong U.S. performance

From 0 to 5 (0="no meaning overlap" and 5="means the same thing"), how similar are the two sentences?

Pick your answer from: 1. 0 2. 1 3. 2 4. 3 5. 4 6. 5
5.