A: Yes and No. In terms of the blend, the flavors will be similar, but in terms of the “character” of the smoke, for instance, the strength of the flavors, will be different, and you may discover flavors in one shape that you didn’t pick-up in another.
Regarding the line, yes, the filler, binder, and wrapper components would be the same, as in the Rocky Patel Sun Grown Test Flight shown here. However, as I alluded to above, the size and width between cigars within the same line extension, or blend for that matter, will reveal a shift in the general nature of the smoke, since, depending on the size and shape of the cigar, more or less filler leaves are used. For example, in a thinner frontmark like a Corona or a Lancero, you will taste more of the flavor of the wrapper, whereas as in a Toro or a Churchill the filler would have a greater impact on the overall flavors.