"And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,"
The EGW passage directly mentions 'the third angel's message,' which is a clear reference to Revelation 14:9.
"Our meeting closed triumphantly. Truth gained the victory. Our brethren renounced their errors and united upon the third angel's message, and God greatly blessed them and added many to their numbers. LS 111.4"
"Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls."
Both passages describe a successful preaching event leading to conversions and an increase in the number of believers. The EGW passage speaks of unity and acceptance of a message, resulting in growth, which is similar to the outcome described in Acts 2:41.