I'm not at all sure what you are talking about. Both constitutions accepted the equality of a free black person and a free white person for apportioning representatives. A free person counted as one, regardless of race. Only chattel was counted by the 3/5ths rule. Likewise, the Declaration of Independence states that all men are created equal, that they are endowed with the unalienable rights of life, liberty, and the pursuit of happiness. Now the confederate constitution differed from the real Constitution in several ways, not the least of which was the specific protection of slavery and slave imports.
REALITY CHECK: " The importation of negroes of the African race from any foreign country other than the slaveholding States or Territories of the United States of America, is hereby forbidden; and Congress is required to pass such laws as shall effectually prevent the same." [Confederate Constitution, Article 1, Section 9, Clause 1]
THE UNITED STATES CONSTITUTION ON SLAVERY
Article 1, Section 2. Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons.Article 1, Section. 9, Clause 1. The Migration or Importation of such Persons as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the Year one thousand eight hundred and eight, but a Tax or duty may be imposed on such Importation, not exceeding ten dollars for each Person.
[Confederate Constitution] Article 1, Sec. 9, Clause 1. The importation of negroes of the African race from any foreign country other than the slaveholding States or Territories of the United States of America, is hereby forbidden; and Congress is required to pass such laws as shall effectually prevent the same.
Article 4, Section 2, Clause 3. No Person held to Service or Labour in one State, under the Laws thereof, escaping into another, shall, in Consequence of any Law or Regulation therein, be discharged from such Service or Labour, but shall be delivered up on Claim of the Party to whom such Service or Labour may be due.
[Confederate Constitution] (3) No slave or other person held to service or labor in any State or Territory of the Confederate States, under the laws thereof, escaping or lawfully carried into another, shall, in consequence of any law or regulation therein, be discharged from such service or labor; but shall be delivered up on claim of the party to whom such slave belongs, or to whom such service or labor may be due.
Article 5. ... Provided that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.
Article 1, Section 2 pertains only to the apportionment of Representatives.
Article 1, Section 9, Clause 1, PROHIBITS any governmental interference with the SLAVE TRADE until 1808. It further PROHIBITS any governmental attempt to tax slavery out of existence by PROHIBITING any tax greater than ten dollars.
Article 4, Section 2, Clause 3, known as the FUGITIVE SLAVE CLAUSE, required the return of any escaped slave or indentured servant. This clause has not been repealed and remains in effect today, however, there are no lawful slaves or indentured servants.
Article 5 PROHIBITED government interference with the SLAVE TRADE.
The Constitution EXPRESSLY PROHIBITS interference with the SLAVE TRADE until 1808.
The Constitution provides no mechanism (other than permitting amendment of the Constitution) for the Federal government to abolish SLAVERY.