Can I expect SMD components from a same manufacturer to be identical?
It depends on the tolerances of each part, as guaranteed by the manufacturer. So are all parts "identical"? No. But as long as your circuit design allows for the min/max variation of each part, there's no reason why you can't do what you're suggesting. Note too that many parts come in various "grades", where essentially the same part is available with better tolerances, a wider temperature range, etc. All of this information can be found in the parts' datasheets.