Considering "their conscience bearing witness therewith, and their thoughts one with another accusing or else excusing them", why would you think these two are in different 'senses'?
Because these guys in Romans 2:13-15 are not saved. What Paul is saying here is that Jews shouldn't boast about having the law because even Gentiles show that they have a knowledge of the law when they do the things written in it. We all know agnostics and atheists who don't steal, don't commit adultery or murder. But that does not mean they are saved.
'For whoever shall keep the whole law and yet stumble in one point, he is guilty of all' (James 2:10). Being a moral sort of guy cannot save anyone. We need a Saviour, and that is the whole of Paul's argument all through Romans 1-3. We need a righteousness that exceeds that of the Scribes and Pharisees (Matthew 5:20), and we can't find it ourselves (Romans 3:20), but God has provided it in the Lord Jesus Christ (Romans 3:21-24). That's the Gospel, you know!
No, I've a very good understanding of it, it's people like you that are completely, utterly enslaved to the presuppositions of the theology they've boxed themselves into that have missed the 'sense' of the passages in Ro 2.
Now think outside of the box Martin. Try. How are the 'doers of the law' of Romans 2:13 any different than the 'fulfillers of the law' in Romans 13:8-10? Or 'the doers' in Matthew 7:12?
1. The doers of the law in Romans 2:13 are not saved (Romans 3:20). They are random Gentiles who sometimes obey the moral law.
2. The fulfillers of the law (Romans 13:8-10) are saved. They are those
'who are in Rome, beloved of God, called to be saints (Romans 1:7).
3. The 'doers' of Matthew 7:12 are
'disciples' (Matthew 5:1). Our Lord therefore commands them as disciples. Whether they were true disciples is another question (John 8:31).
2 & 3 do not obey the law in order to be saved; they do so because they
are saved.
'And everyone who has this hope in him purifies himself even as He is pure' (1 John 3:3). The love of God has already been bestowed on them (v.1) and they are children of God, born again by the Spirit of God and zealous of good deeds. Now the same John who wrote 3:3 also wrote 1:8-10, so we are not talking sinless perfection, but if someone makes no effort to purify himself, it does not mean that he's lost his salvation; it means he never had it (Matthew 7:23).
This is something every professor of Christ had better be doing. Period. No 'laughing' matter.
14 What doth it profit, my brethren, if a man say he hath faith, but have not works? can that faith save him?
15 If a brother or sister be naked and in lack of daily food,
16 and one of you say unto them, Go in peace, be ye warmed and filled; and yet ye give them not the things needful to the body; what doth it profit?
17 Even so faith, if it have not works, is dead in itself. Jas 2
41 Then shall he say also unto them on the left hand, Depart from me, ye cursed, into the eternal fire which is prepared for the devil and his angels:
42 for I was hungry, and ye did not give me to eat; I was thirsty, and ye gave me no drink;
43 I was a stranger, and ye took me not in; naked, and ye clothed me not; sick, and in prison, and ye visited me not. Mt 25
Well Amen to all that! We are saved by Christ alone, by grace alone, through faith alone, but the faith which alone saves does not stay alone. Our salvation is
'not of works lest anyone should boast,' but
'we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand that we should walk in them.' If we have no works, it seems likely that we are not God's workmanship, but we do not become God's workmanship by doing works. We do works when we have been saved by grace through faith.