"Teaching the People to Be Liberal Never should the laborer who raises up little companies here and there, give the impression to those newly come to the faith, that God does not require them to work systematically in helping to sustain the cause by their personal labors and by their means. Frequently those who receive the truth are among the poor of this world; but they should not make this an excuse for neglecting those duties which devolve upon them in view of the precious light they have received. They should not allow poverty to prevent them from laying up a treasure in heaven. The blessings within reach of the rich are also within their reach. If they are faithful in using what little they do possess, their treasure in heaven will increase according to their fidelity. It is the motive with which they work, not the amount they do, that makes their offering valuable in the sight of Heaven. GW 222"
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:"
The EGW passage encourages believers, even the poor, to lay up treasure in heaven, which is the central theme of Matthew 6:20. The connection is clear and meaningful.
"All should be taught to do what they can for the Master; to render to Him according as He has prospered them. He claims as His just due a tenth of their income, be it large or small; and those who withhold this, commit robbery toward Him, and cannot expect His prospering hand to be with them. Even if the church is composed mostly of poor brethren, the subject of systematic benevolence should be thoroughly explained, and the plan heartily adopted. God is able to fulfil His promises. His resources are infinite, and He employs them all in accomplishing His will. And when He sees a faithful performance of duty in the payment of the tithe, He often, in His wise providence, opens ways whereby it shall increase. He who follows God's arrangement in the little that has been given him, will receive the same returns as he who bestows of his abundance. GW 222.2"
"Will a man rob God? Yet ye have robbed me. But ye say, Wherein have we robbed thee? In tithes and offerings."
The EGW passage directly quotes and expands upon the concept of robbing God in tithes and offerings from Malachi 3:8. It's a clear and undeniable allusion.
"Upon the first day of the week let every one of you lay by him in store, as God hath prospered him, that there be no gatherings when I come."
Both passages discuss giving according to how God has prospered individuals. While 1 Corinthians 16:2 focuses on weekly giving, the underlying principle of proportionate giving is the same.