That one in the blue has a label on its pot

Where are you in Canada?

Im in Toronto and low goes to 13c and high 22c and I have all my semps, succulents and sago palm outside. I think cacti will do fine during our summers. 40c is the max the temps will ever go. But Im not an expert in cacti so dont take my word for it :)

You've got a lot of reading to do, to familiarize yourself with this group of plants and what they need to grow healthy.

The middle plant is NOT a cactus, it's not even from the same continent as cactus. It is from the genus Anacampseros, not sure of the species but maybe A. rufescens.

The other questions you ask about repotting and leaving outdoors - in short, yes you can repot into the same container, but it should be replaced with a much better formulation. And yes, you can leave your plants outdoors unprotected for many months but before you do that, you have to understand your plants, their needs, and your environment.

Like I said before, lots of reading is in your future...

Adding to excellent advice by X...

I'm pointing out something that is obvious to me, but may not be to you...your 2 cactus have "glufers" on them. The blue strawflowers on the left & the green strawflower on the right, among the real flowers of the plant! These things are hot-glued on. Terrible practice they do to "trick" folks (I believe). You need an X-acto knife heated up to try to remove the glue without damaging the cactus too much.

What do the labels say on the 2 cactus pots? Looks like an Altman plants logo on the one. The one on the right looks like it may be Rebutia muscula.

I agree, the middle plant looks like Anacampseros rufescens.

The one on the left would be Pilosocereus gounelli