Pulling to the side after I let off the accelerator?

Are all 4 tires the same or do you have one size on one end? The pull could be caused by a bad tire or worn suspension parts. The first thing I would try is to swap the tires front to rear and see if the condition changes. If it does you have a bad tire. If not, then you would want to put the car in the air and look at the various bushings in the front suspension.

Different brands are also commonly different actual sizes as well. So, say you have 205-75 18 tires, those are the "nominal" size. However, the actual tire can be different depending on how they actually measure the tire and how closely they follow the standards as well as the type of tire. I've seen two tires tagged as the same size actually be an inch different when installed on the same rim. It's especially bad in the lower end tires. Being you are not driving an AWD it shouldn't damage anything but if they are worn different and different brands that could be the reason.

Very likely they are not. The tire measurements are supposed to be a standard thing, however where the tires are actually measured for those is not a standard. So an 18" rim size is a standard, it will fit a 18" rim. 235 would be the section width. However that width only applies if the tire is on a specified rim width. So say you have a Goodyear and they measured that 235 width on a 6" wide rim. However the Yokohama tires are 235 but measured on a 5.5" rim width. The rule of thumb is that the section width changes approximately one quarter of an inch for every half inch of rim width change. Now the aspect ratio is based on that section width multiplied by a factor of the section height. The section height is determined by mounting the tire and inflating it to service pressure and then measuring from the bead area to the tread surface. So take two manufacturers and two 235 75 18 tires. So a 235mm section width multiplied by 75 percent for section height on a 18 inch rim. That tire can be mounted on a variety of rim widths in the real world. So your car could come stock with 18X8 or 20X8 rims. Now you buy 18" tires all in the "same size" but one brand used a 7" rim to measure the width and the other used an 8" rim. The tires won't actually be the same size. That really matters on an all wheel drive because it can strain the drivetrain. On a front wheel drive it can cause handling issues because of the size, plus the tires may not be the same compounds and tread patterns. All of those combine to make interesting issues depending on the vehicle. For instance I drive an AWD Journey, I have three full sets of tires, all are branded as 225-65 17. However the 4 Firestone snow tires are 29.6" in diameter, the Goodyears are 27.74" in diameter and the Yokohama tires are 28.5" in diameter, all mounted on the same factory rims.

Caster typically won't cause a pull. Camber and toe can. The rear camber could be enough to cause an issue but that might not be adjustable without an add on kit to allow adjustment.

That is the inner tie rod end and the boot that covers it is off. That isn't a good thing as it can cause a lot of wear, however if you can try to "steer" the tire and don't see or feel play in that joint it isn't what is causing this. The thing is you will want the boot repaired to keep any more damage from happening. It might just need a new clamp ring installed.