It is not true things have changed. Many have wanted people to believe that. You will quickly see the BC and the CCC are not opposed. The Church has no authority to change what Christ handed down. The truth is the truth and will always be.
Some things have changed. Cremation used to be a mortal sin and subject to excommunication
When Canon Law was promulgated in 1917, it summarized the previous condemnation of cremation in the following three canons:
Canon 1203: “The bodies of the faithful must be buried, and cremation is reprobated. If anyone has in any manner ordered his body to be cremated, it shall be unlawful to execute his wish.”
Canon 1240, 5° says that “Persons who have given orders for the cremation of their bodies are deprived of ecclesiastical burial, unless they have before death given some signs of repentance.”
Canon 2339 “Persons who, in violation of the prohibition of Canon 1240, dare to order or force the ecclesiastical burial (of those who are to be deprived of it) incur excommunication ipso facto; and persons who of their own accord give ecclesiastical burial to the above mentioned, incur an interdict from entering a church.”
This is the new teaching of the Church
Canon 1176 §3. The Church earnestly recommends that the pious custom of burying the bodies of the deceased be observed; nevertheless, the Church does not prohibit cremation unless it was chosen for reasons contrary to Christian doctrine
2301 Autopsies can be morally permitted for legal inquests or scientific research. The free gift of organs after death is legitimate and can be meritorious.
The Church permits cremation, provided that it does not demonstrate a denial of faith in the resurrection of the body.93
Non-Catholics can, under certain circumstances receive Holy Communion. The receiving of any sacrament of the Church has always been forbidden
The 1917 Code of Canon Law forbids this sacrilegious practice:
“It is forbidden to administer the Sacraments of the Church to heretics or schismatics, even though they err in good faith and ask for them, unless they have first renounced their errors and been reconciled with the Church.”
This is the current teaching
§4. If the danger of death is present or if, in the judgment of the diocesan bishop or conference of bishops, some other grave necessity urges it, Catholic ministers administer these same sacraments licitly also to other Christians not having full communion with the Catholic Church, who cannot approach a minister of their own community and who seek such on their own accord, provided that they manifest Catholic faith in respect to these sacraments and are properly disposed.
In 1998 President Bill Clinton was given communion by a Catholic priest in Africa and at the funeral of Pope John Paul Protestant Roger Schultz waas given communion by Cardinal Ratzinger.
In the 1917 Code of Canon Law (Canon 1258) Catholics are forbidden to participate actively in the worship of non-Catholics (communicatio in sacris):
“It is unlawful for the faithful to assist in any active manner, or to take part in the sacred services of non-Catholics.”
Canon 2316 “A person who of his own accord and knowingly helps in any manner to propagate heresy, or who communicates in sacred rites (in divinis) with heretics in violation of the prohibition of Canon 1258, incurs suspicion of heresy.”
Catholic priests and bishops and laity now participate in Protestant services.