Is Kirsten Gillibrand right that she's more open to changing her mind than Trump?

Senator Kirsten Gillibrand (whom I've voted for repeatedly) said this in a CNN town hall:

"When I was a member of Congress from upstate New York, I was really focused on the priorities of my district," the New York senator said during a CNN town hall. "When I became senator of the entire state, I recognized that some of my views really did need to change."

Before becoming a senator in 2009, Gillibrand represented a largely Republican district in the House and expressed ideas on immigration — from blocking certain benefits for undocumented immigrants to establishing English as an official language — that have come back to haunt her as she seeks the Democratic nomination in 2020. . . .

During the town hall, Gillibrand said she has changed considerably since her times in the House, and that she was "ashamed" of her past positions. She used her ideological evolution to further distance herself from the president, who she said is incapable of change.

"For people who aspire to be president, I think it's really important that you're able to admit when you're wrong and that you're able to grow and learn and listen and be better, and be stronger," Gillibrand said. "That is something that Donald Trump is unwilling to do."

She was also asked about her dramatic shift on guns: she currently has an F rating from the NRA, not surprisingly for a Democrat . . . but she used to get an A.

So, Gillibrand says she's changed her mind again and again, while Trump is unwilling to change his mind. But wait — by her own account, she changed her mind because her job changed from representing a relatively conservative district in upstate New York to representing the whole state, which is more liberal.

Well, Trump has also changed his views. He used to be pro-choice. Trump admitted in 2015: "At one point, I was a Democrat. As Ronald Reagan changed, I also changed. I became much more conservative. I also became a Republican."

In 1999, Trump said he wouldn't want to ban "partial-birth abortion": "I'm very pro-choice. . . . I am pro-choice in every respect."

Trump said in 2004: "In many cases, I probably identify more as a Democrat. . . . It just seems that the economy does better under the Democrats than under the Republicans." As you can see in that video, he said in another video (I'm not sure when) that he was "liberal on health care."

But then Trump changed many of his positions — why? We can't know, because we can't read his mind, but the most likely explanation would seem to be that he wanted to run president, and he thought he'd have the best luck vying for the Republican nomination.

Is Trump really so different from Gillibrand? Don't they both change their positions depending on what job they had or wanted?