Should I change all floors or only one?
If this is what you mean by parquet, I don't suggest it. If water ever penetrates (which it will if spilled on) this floor is over with. That real wood you have there is gorgeous. Refinish it by sanding, stain if you want and varnish it with a lamb's wool mop, using oil-based products. Replace the vinyl with as close a match as possible (same plank width, thickness, grain structure and color) and do it all in one shot. Sand a piece of your wood and take it to the store to match it. If it doesn't look 100% alike, or even if it is a completely different type, a threshold at the parting line will make it 'all better now'. If you don't have access to professional flooring equipment, I suggest getting a random orbit sander, it will be worth every penny for this job.