The apostles being accused by the Pharisees for breaking the Sabbath, just as they accused Jesus of doing so and not being equal to God has nothing to do with Heb 7.
Heb 7 is about the priesthood being changed because the law said it had to come through the tribe of Levi, but Jesus came from the tribe of Judah. In order for Jesus to be our High Priest in the New Covenant- the law- the priesthood had to change.
Heb 4:11 Therefore, if perfection were through the
Levitical priesthood (for under it the people received the law), what further need
was there that another priest should rise according to the order of Melchizedek, and not be called according to the order of Aaron? 12
For the priesthood being changed, of necessity there is also a change of the law. 13 For He of whom these things are spoken belongs to another tribe, from which no man has [
b]officiated at the altar.
14
For it is evident that our Lord arose from Judah, of which tribe Moses spoke nothing concerning [c]priesthood.
The apostles never broke the Sabbath commandment, there is no such violation to eat on the Sabbath. Hence why Jesus said they were guiltless Mat 12:7
Jesus never bended the rules for Him and the apostles, which would make Jesus a hypocrite because He condemned the Pharisees for keeping their own rules instead of obeying the commandment of God quoting directly from the Ten Commandments Mat 15:3-15
Jesus said the Sabbath was made for man Mark 2:27 man was created on the sixth day in the image of God Gen 1:26 the Sabbath was created after man. Jesus being Lord of the Sabbath means He is the Creator of it so He would know how to keep it. The Sabbath was made for man to bless Isa 56:1-6 and sanctify man, because man can't sanctify themselves Isa 66:17 we need God for everything Eze 20:12