There is a difference. If you are talking about the church, roughly 35-70AD, the canon of scripture was just then being completed.
For example, when the Apostle Paul, under inspiration of the Holy Spirit, wrote to Corinth they did not yet have the full counsel of God's revealed will (His Word).
Once established, based upon the Holy Spirit's revelation through the prophets and apostles (Ephesians 2:20), the faith was "once for all" (until the end of this world) set for God's people (Jude 1:3).
That's true now, even if this is the first time a particular person, or group of persons have heard it.
God has revealed all His will by special revelation- and all creatures, even those dominated by false religion and culture derived from it MUST obey it.... now.

Also, part of the high calling of elder is to whom much is given, much is required.
Others will watch everything you do, including how carefully you observe the sabbath. If you try, come what may, by God's grace to keep the sabbath (and we agree Westminster XXI is a faithful summary of the doctrine of Scripture) you will set an example of worshiping the one true God in spirit and in truth.
That is our reasonable service.
Let me also echo Pergamum's wise counsel, born of experience.
While I would be willing to suffer something at least to keep the sabbath, remember that works of necessity are established as part of command four.
The necessity, though is in the works themselves being done at that time (e.g. the doctor must operate today or the patient might die, etc.), not our own convenience (e.g. a carpenter says he must work on Sunday or his boss will demote him).
Tough, it seems but God will bless obedience.
This culture will be accustomed to strict adherence of a holy day- so your carefulness to keep it as a matter of command will not be lost on them.
What you will have opportunity for is to show the sabbath is to be a delight, is merciful, allows for necessity and mercy to prevent harm to neighbor, etc. Something to look forward to every week.... on Sunday.
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