Was the covenant of grace always adminstered after one and the same manner?

The covenant of grace was not always administered after the same manner, but the administrations of it under the Old Testament were different from those under the New.[1]

1. II Cor. 3:6-9

....who has made us competent to be ministers of a new covenant, not of the letter but of the Spirit. For the letter kills, but the Spirit gives life.

Now if the ministry of death, carved in letters on stone, came with such glory that the Israelites could not gaze at Moses' face because of its glory, which was being brought to an end, will not the ministry of the Spirit have even more glory? For if there was glory in the ministry of condemnation, the ministry of righteousness must far exceed it in glory.

Question 33, Westminster Larger Catechism.

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