I was always a bit uncertain of the difference between the two. I checked around, and got some good ideas, but nothing concrete. Most followed the format (or at least, maintained the same level of general discourse) of this video:
Same problem arises; speaks to all of his powers, but not directly separating what he was born with, and what he gained via the alien tech.
Complicating matters is that Apocalypse can apparently retain the powers of mutant bodies he has inhabited before, making his original abilities even murkier.
Can anyone please clarify this? Specifically, we should look at:
What are ALL of Apocalypse's powers
What powers he has as a mutant, i.e. his original abilities
What powers he got from the Celestial technology and how those affected/augmented his natural abilities.
What powers he retains from other mutants
To what degree his powers are amplified due to this blending.
Canonical sources may be best, but considering there are a number of sources in various media, and different versions, if evidence is provided, it can be pulled from all of them.