No. Well. Mostly No.
Grid is much newer than Flexbox and has a bit less browser support. That’s why it makes perfect sense if people are wondering if CSS grid is here to replace Flexbox.
To put a point on it:
Grid can do things Flexbox can’t do.
Flexbox can do things Grid can’t do.
They can work together: a grid item can be a flexbox container. A flex item can be a grid container.
Even though Grid is pretty …
Does CSS Grid Replace Flexbox? is a post from CSS-Tricks