Caroline Rhea made an interesting observation when rewatching one of her past acting roles.

In an exclusive interview with PEOPLE to discuss the return of Phineas and Ferb, the 61-year-old actress spoke about the process of voicing her character Linda Flynn-Fletcher once again now that the animated series has returned for a fifth season following a more than 10-year hiatus. She noted that "it's weird that your voice ages."

She then shared that she recently caught an episode of Sabrina the Teenage Witch while on a flight to Hawaii, and was surprised to notice that her voice sounded much different.

"I was watching Sabrina … and I was literally like, 'Was I 15 when I made this show?' And then I was like, 'Oh, OK.' Now, I feel like my voice is much deeper than it was," she says.

"I try to make it the same sound as Linda Flynn-Fletcher, older," she adds, referring to her Phineas and Ferb voice work.

Sabrina the Teenage Witch, which aired from 1996 to 2003, starred Melissa Joan Hart as the titular Sabrina Spellman, who learns on her 16th birthday that she has magical powers. Her 600-year-old aunts and fellow witches, Hilda (Rhea) and Zelda Spellman (Beth Broderick), step in to guide her on the proper and safe use of her magic.

While Rhea's voice may have deepened in the years since Sabrina wrapped, the show's cast believes the project would hold up well with audiences today — apart from one aspect.

During a conversation with PEOPLE at 90s Con in September, Hart, 49, said Sabrina could still air now, but one character's dialogue would likely need a major rewrite.

"Salem, some of Salem's lines might have to change," she said, referring to a 500-year-old witch who was sentenced to live as a sassy, talking black house cat. "Like he might've been a little racy, might have been a little inappropriate."

"There were things that went over kids' heads that were for the adults. But that was mainly Salem's lines," Hart added.

During Rhea's recent conversation with PEOPLE, she shared how it's heartwarming to see the impact that Sabrina had on the fans who watched the show at the time.

"You know what I love seeing? It's so kind when someone comes up and says, 'I grew up watching you.' I have such — when I see little girls that, well, they're not little girls, but Taylor Swift loved Sabrina," she says.

Rhea recalled meeting Pink and learning that she, too, was a Sabrina fan.

"She loved Sabrina, she loved that show. So, I'm literally gushing over Pink and she's like, 'You don't understand what your show meant to me,' " the Sydney to the Max star recalls of their meeting.

"And it's just a generation of women," she continues. "I really think in music, they're so strong and impressive, and I think of them as like little Sabrina watchers."