"There are many who are not satisfied to serve God cheerfully in the place that He has marked out for them, or to do uncomplainingly the work that He has placed in their hands. It is right to be dissatisfied with the way in which we perform duty, but we are not to be dissatisfied with the duty itself because we would rather do something else. In His providence God places before human beings service that will be as medicine to their diseased minds. Thus He seeks to lead them to put aside the selfish preference, which, if gratified, would disqualify them for the work He has for them. If they accept and perform this service, their minds will be cured. If they refuse it, they will be left at strife with themselves and others. GW 270.1"
"But as God hath distributed to every man, as the Lord hath called every one, so let him walk. And so ordain I in all churches."
Both passages emphasize the importance of accepting and fulfilling the duties and roles that God has assigned, even if they are not what one would personally choose. The EGW passage elaborates on the idea of service as 'medicine' for the mind, while 1 Corinthians 7:17 encourages everyone to walk according to their calling.
"Let those who are not permitted to rest in quietude, but who must be continually on the move, pitching their tent tonight in one place and tomorrow night in another place, remember that the Lord is leading them and that this is His way of helping them to form perfect characters. In all the changes that they are required to make, God is to be recognized as their companion, their guide, their dependence. GW 270.2"
"And the Lord went before them by day in a pillar of a cloud, to lead them the way; and by night in a pillar of fire, to give them light; to go by day and night:"
Both passages refer to God leading people through a journey, even when that journey involves constant movement and change. EGW uses the imagery of pitching tents in different places, while Exodus describes God leading the Israelites with a pillar of cloud and fire. The core idea of divine guidance during a transient experience connects them.