Don Johnson

2Co 11:4 “For if someone comes and proclaims another Jesus than the one we proclaimed, or if you receive a different spirit from the one you received, or if you accept a different gospel from the one you accepted, you put up with it readily enough.
2Co 11:5 Indeed, I consider that I am not in the least inferior to these super-apostles.
2Co 12:11
2Co 12:12
The signs of a true apostle were performed among you with utmost patience, with signs and wonders and mighty works.

Paul is contrasting his apostleship with false apostles, who claim they are super-apostles. He is not contrasting it with the 12 or other true apostles.
Paul did see the resurrected Christ, but did not see Jesus between the resurrection and the ascension. He can testify to it, as Jesus told him about it.

1Co 15:3 For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures,
1Co 15:4 that he was buried, that he was raised on the third day in accordance with the Scriptures,
1Co 15:5 and that he appeared to Cephas,
1Co 15:6Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep.
1Co 15:7Then he appeared to James, then to all the apostles.
1Co 15:8
“Last of all, as to one untimely born, he appeared also to me.”

In 1 Cor 15:5 who are the 12 that Jesus appeared to? My claim is that it cannot include Judas Iscariot and so must include Matthias. We also see that the 12 are NOT THE SAME as those called apostles.

2 Cor 12:11 “I have been a fool! You forced me to it, for I ought to have been commended by you. For I was not at all inferior to these super-apostles, even though I am nothing.”