In terms of Christian doctrine, SDA or Hebrew roots will cover most of the sabbath keepers. In terms of law keeping that is a distinction without a difference because they both believe they are still under the law of Moses.
For those whom God has revealed that there is no division between Israel and the church, that ALL Israel is to be saved, and the two houses (Israel and Judah) are to be restored into ONE KINGDOM and returned to the promised land, we understand Christ sacrifice for "His people". Now, the most important thing to remember is that whoever wants to join Israel, whether native born, lost and returning, or a stranger/sojourner, adopted or grafted in (Romans 11), we are all to abide by One Law, under One God.
Exodus 12:49 One law shall be to him that is homeborn, and unto the stranger that sojourneth among you.
Leviticus 7:7 As the sin offering is, so is the trespass offering: there is one law for them: the priest that maketh atonement therewith shall have it.
Numbers 15:16 One law and one manner shall be for you, and for the stranger that sojourneth with you.
Numbers 15:29 Ye shall have one law for him that sinneth through ignorance, both for him that is born among the children of Israel, and for the stranger that sojourneth among them.
God has always provided GRACE and His final sacrifice that paid the debt we owed for "the law of sin and death", Yeshua/Jesus paid for all of us so that we could come back to the covenant, with the newness of providing each of us individually with the Holy Spirit, the one who writes the commandments on our hearts. Without Christ, there can be no future marriage to the bride/Israel/church.
Now, one more time, I don't want anyone to be confused when I speak of "His people Israel". Because the invitation to join Israel is for the whole world. Christ died for the whole world. The testimony of Christ and the keeping of the commandments is how you know that you have God the Father and Christ the Son.
To those who have belief (and some very strong belief) that the law is bad and to desire to follow any of it will put you in Hell, I say to each his own until judgment day. I have love, joy and peace. I have endurance to keep to the course until the very end. I have patience in sharing the gospel of Christ, that is the gospel Christ preached, the Kingdom of God/Heaven is coming. The Kingdom that restores the house of Israel and the house of Judah (including all those who choose to join this commonwealth).