You know, actors are actors. I think sometimes.....if it is possible...the casting director may try to get an actor who resembles the character who will be portraying a parent. However, it definitely is not possible to do all the time. And NO, I don't see any resemblance to Quinn whatsoever, outside of they are both male and have dark hair. And that description would go for thousands of males.
I don't think Daniel resembles Maggie, or EJ resembles Stefano. NONE of his children ever did. I don't think any of the Brady children look like Shawn & Caroline. Isabella did not look like Victor.
Yes, I know people can resemble other people. I had folks walk into a place where I was working once, swearing I looked exactly like someone back home.
Yes, it happens. I even watched a makeup artist in a department store, via makeup, turn a woman into an exact replica of Judy Garland, and another into Elizabeth Taylor. It was amazing.
I have watched actors in movies change their appearance, their voice, etc. Just watch Meryl Streep for instance.