Yes, in a number of ways. You could fortify the wine with brandy spirit before fermentation has completed (like what they do to port) which would leave sugar in the juice. You could harvest the grapes later in the year (like what is done in Germany) when they've shriveled and concentrated their sugars. Also, you could simply add sugar to the juice after it has fermented, a process known as chaptalisation when done to sparkling wines.

Almost certainly not. French chablis must contain chardonnay grapes from the chablis region. US chardonnay must contain 80% chardonnay grapes from anywhere. Any other civilized country's chardonnay usually does contain at least some chardonnay. Any 'chablis' from anywhere else can, and usually does, contain any kind of grape or any fruit juice from anywhere on the planet. Some winemakers now use the word 'chablis' to mean 'white wine'. Good idea => do your own homework online before spending very much money.

Chardonnay wines are heavier than Riesling, and they tend to be more complex as far as aroma goes, featuring citric notes. Chardonnay wines undergo malolactic fermentation, while Riesling doesn't. Hence, the Riesling is a lighter wine that offers a fresh aroma.

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