Image URLs from previous Domain

I have created a website suppose https://www.previoussite.com and there I have uploaded images in post and now I have moved the hosting and uploaded the same file to different domain now I am seeing image URLs having previoussite.com/imagename.com in my new website also.

My question is If previoussite.com will stop working can my new website image will be visible or it will also not be visible.

Is there any way to replace those URL with my NewURL.com OR I need to upload the images again for my newURL.com