No, they are not the same product and will not produce similar results.
yes you can _______ Red cooking wine would be a better substitute as sherry has a red wine base. White cooking wine wouldn't have the same depth.
No. Sherry wine is a drinkable sherry, that can be used in cooking, while sherry vinegar is used only for cooking.
Sherry is a wine that is fortified with brandy. Medium dry sherry is a cooking wine that is used in a variety of recipes.
Your best bet is to go to the wine and/or liquor store and get real sherry (wine fortified with brandy). Avoid the grocery store stuff labelled "cooking sherry".
You can use equal parts dry sherry/pale sherry wine; not the cooking wine... the drinking wine. :)
You could substitute rice vinegar for cooking sherry. Rice vinegar has a mild, sweet flavor.
It will change the taste.
Yes, any good quality white wine can be used instead of sherry.
Cooking sherry is low-quality sherry with salt added. There is no reason to buy cooking sherry. Purchase any inexpensive sherry and this will give you better control over the sodium content of your food. For a non alcoholic substitute try a mixture of vinegar, sugar and a dash of lemon juice OR a mixture of apple, cranberry and grape juice. Orange or pineapple juice can also be used.
In cooking Apple juice or apple cider can fill the bill.
It wouldn't be practical
Well, its cheap sherry that you would consider not quite good enough for drinking, or any sherry that has been open to the air for long enough to alter its flavour slightly (say a few weeks) but you don't want to just throw it away.