I’m no pro with tractors, but we just sold one of our tractors (john deere 4600 series, 43 hp and 34hp PTO) and now have a kubota L6060 (60hp and around 50hp pto). The front end equiptment (bucket, fork, snow pusher etc) will not work from one brand of tractor to the other (this goes with pretty much all brands of tractors). The hook ups are different, so we have to sell all of our JD stuff and buy Kubota forks, snow pushers etc. All of our PTO driven eqipment will work (6ft finishing mower, bush hog, ring conditioner, snow blower etc) but this is because we are buying a tractor with more power, and since the equipment worked on our older less powerful tractor, it will work on our new tractor. If we were getting a smaller tractor, we would need to find out the HP on the PTO to see if the equipment would run.
For our tractors, you can remove the bucket and then put on the different attachments. We have a seperate hay spear that has two “tines” so we can pick up large square bales of hay (we have picked up 2 x 800lb bales with our JD and our new Kubota can pick up 3800lb) and it is also used to move skids around. Very handy attachment for us.
You will need to know the hp of the tractor and the hp of the PTO as that will tell you what you can run on the PTO (for grass cutters, bush hogs etc) or lift up (for bucket or hay fork etc). This is very important when you are shopping. You will need an idea on what you will be lifting or cutting, then you can go tractor shopping. You can find the specs (HP and FEL weight lifting capabilities) if you google the year and model of the tractor that you are looking at. This way at least you will have a starting point. Or you can call a dealership of the brand that you are looking at as they should also be able to tell you the info on it.
Its no fun either over or under buying equipment, it can get very expensive!
Someone mentioned weights for the back of the tractor, this is also important, but you can also load the tires. We have had one tractor with a weight sticking out on the back, but it was more cumbersome as you had to be very mindful in tight spaces - you needed really wide turns when it was added on. We now just load the tires and its much easier as you dont have the weight stuck out behind you, plus when the weights were on, you couldn’t use the PTO so it was constant switching back and forth.