Ideally... yes. They should match from an aesthetic standpoint.
((If money is no object, quit reading here))
I'm a DIY period remodeler, on a shoestring. As in, I budget $100 a month for remodeling... which means it takes me 3 months to buy the wood for something, and then the wood lives in my basement while I save up for other materials. Or I can do a couple of small $30 projects each month: like I can buy enough paint for one room, or I can add moulding to one room, or beadboard the bathroom, or I can replace the pantry door, etc. So from a tight budget concern: If you're talking 4 hinges... have at. You're looking at $20. If, instead, you're redoing ALL the hinges in the house you could be looking at up to a couple hundred $. Totally depends on your house. I would personally do something that has more impact than hinges if I'm dropping a couple hundred. Like sanding & restaining or repainting cabinets, or drywall, or paint, or tile, or fence.
But like I said... I'm on a shoestring. If you're not... why not replace them all at once? Super easy... 10 seconds a hinge with an electric screwdriver.