It would better, but grafting knives are not necessary. Just make sure the blade gotta be a clean and sharp. I use a regular box cutter razor.
Max

I use my old kitchen knives, I cook a lot so I have high end knives that are very sharp and last for years. I always hone with a steel, then wash with RO water, then vodka, then run a lighter under it for a few minutes (infection is the main cause of failed grafting, so sterilize, then sterilize, and when you think it's good, sterilize again). It produces incredibly clean cuts, but remember the faster you do it, the cleaner the cut.
I also like to put my scions in lightly chlorinated water, then dry. Make the cut on the rootstoock then graft immediately, don't wait or look for your tape, have everything ready befor you start.