"Opportunities in Commercial Work One of the means by which these institutions are brought in contact with the world is found in commercial work. A door is thus opened for the communication of the light of truth. 7T 161"
"Neither do men light a candle, and put it under a bushel, but on a candlestick; and it giveth light unto all that are in the house."
The EGW passage speaks of institutions being a means to communicate the light of truth, which is a clear parallel to the idea of not hiding one's light under a bushel in Matthew 5:15.
"The workmen may think themselves doing only worldly business, when they are engaged in the very work that will call out questions in regard to the faith and principles they hold. If they are of the right spirit they will be able to speak words in season. If the light of heavenly truth and love is in them, it cannot but shine out. The very manner in which they conduct business will make manifest the working of divine principles. Of our workers, the artisans, as of one of old, it may be said: “I have filled him with the Spirit of God, in wisdom, and in understanding, and in knowledge, and in all manner of workmanship.” Exodus 31:3 . 7T 161.3"
"And I have filled him with the spirit of God, in wisdom, and in understanding, and in knowledge, and in all manner of workmanship,"
Ellen White directly references Exodus 31:3 in this passage.
"Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man."
While the EGW passage references Exodus 31:3 directly, the connection to Colossians 4:6 is less direct. The idea of speaking words in season and the manifestation of divine principles in one's conduct can be loosely connected to the grace and wisdom mentioned in Colossians 4:6, but it's not a strong or explicit parallel.