Can I use my old iMac as a second screen for my new one?

I have an old iMac (about 4-5 years) that I don't use anymore and a new iMac that I just bought a few months ago.
Can I us my old iMac as a second display for my new one? Its a slow computer now, but the screen is nice and big so it would be nice to be able to keep using it like that.
If yes, what cord(s) would I need to make this happen?
If no, is there any disadvantage to using a non-mac screen for a second display? (I'm a graphic designer, so little things like having the color exact on each screen are very important)
Thanks for the help!

Is there any way to do it without lag? Right now it works, but its really annoying to have things so slow on the other screen.
Is there any way to hook them up so they work like an actual dual monitor setup (wired connection with no lag)?

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