Will an iPhone 4s case fit an iPhone 4?

So my iPhone 6 got stolen about a month ago, and the earliest I can get a new one is Christmas. Later than that if I decide I don t want it then, because that s all I d get. But because I don t have my iPhone 6 anymore, I have my mom s old iPhone 4. I was on Instagram, saw a shop with cute iPhone cases, got on my computer and went on the site. When you click on the case, and you choose the size, it says things like "4(s)" and "6(s)" so I m assuming it s kinda stretchy and would fit, but just to be sure, do you think it will?
Added (1). Edit: could this work with an iPhone 6 as well, if I buy a case for when I get a new one also?

Read more: Will an iPhone 4s case fit an iPhone 4?